Speakers do not typically come supplied with speaker wire (speaker cables).  So buy a spool of 16 gauge speaker wire and you will have what you need.  Assuming you have a pocketknife or wire stripper to expose the ends.

You can also get speaker cable that comes with "spade lugs" or "banana" connectors.  Monoprice.com is good quality and cheap prices.  Or go more upscale and look at brands such as Audioquest, Kimber, Cardas, MIT, etc.

Just make sure you hook up your wire to the speakers and the receiver properly/consistently, so the speakers are "in phase" when they play.  Your manuals will tell you how to do this.   It's simple and if you don't see it in the manual then ask again here.

That HK has a built-in phono preamp so you don't need a separate one.

Looks like a nice start. I assume you have an anti-static record brush, and stylus cleaner?

Your speakers will not come from the manufacturer with wire. You can just buy some off the shelf speaker cables made to the length you need, and they will probably sound fine.

What you should look for is wire with low resistance. The speaker manufacturer often states the maximum allowed resistence for the speaker connection in the owners manual. For example, the B&W 686 manual has 0.1 ohm as the maximum resistance for the connection.

The resistance for a wire is dependent on its thickness and length. Many people just grab some 18 gauge "speaker" wire from the local electronics store.  16 gauge is better, and I have often used even thicker 14 gauge lamp cord from the hardware store, in non-critical applications. 14 gauge wire is the thinnest gauge I will use, and currently use it for fairly long runs to my outdoor speakers.

If you google "speaker wire gauge resistance" you can find the information to figure what gauge to get. The largest facter in the decision is the distance from your amp to your speaker. Longer distances require thicker wire (smaller gauge #) to keep the total wire resistance low. Remember that you need to count the length of wire to the speaker, plus back again, since it's a two conductor wire.

As to the B&W 686's 0.1 ohm limit. 16 gauge stranded copper wire has a resistance of .0041 ohms/ft. So 16 gauge wire will be at the B&W's specified limit at 24 ft. Counting both the out, and return path, you'd have to be inside 12 ft of speaker cable at the best. No problem? I don't like living so close to the edge myself.

Moving one step, to a thicker 14 gauge wire will reduce the resistance by about a third. I suppose if your speakers are only four feet apart you could use a thinner gauge, but you really can't have wire that's too thick (electrically). I'll soon be ordering some 10 gauge for a 15 ft run.

Here is a link to a handy calculator  http://www.stealth316.com/2-wire-resistance.htm

Just to mention that I've recently been trying out some 14 gauge black low-voltage 2-conductor wire from the hardware store, that I think is meant for low voltage outdoor lighting, or something. I'm only using it for smaller, lower-fi speakers though.

I would get a 100 foot roll of Monoprice speaker 14 gauge speaker wire. You can get a wire stripper from Radio Shack or MCM Electronics if you don't have one. I suggest that you not use 16 gauge or smaller wire.

Their part number is #2791 and it only costs about $25.

It is high-quality copper wire and will be very good for your needs.

IMO there are speakers that sound much better than either B & W or Polk in that price range, so you might want to do some more shopping for speakers. Those are two brands of speakers I would rank relatively low in sound quality, and they are overpriced IMO also.

One example is the Wharfedale Diamond 10.1 and 10.2 speakers; they are excellent speakers that sell for $349 and $449 per pair at Music Direct. They have had rave reviews from the audio magazines etc.

Another example is the Focal Chorus 705V and 706V speakers; they are also excellent speakers that are available from Music Direct and other sources, and are in that price range.

If you want some speaker cables that are higher-quality, i am selling one set. They are Audioquest Type 4 cables that are 8 feet long. They are factory-terminated with gold spade lugs on one end and gold push-in (banana-type) connectors at the other end. New cost is $220 from Audio Advisor and I am selling them for $80. Send me a PM if interested.

The H-K 3490 is a very good choice IMO. It has good sound quality and you would have to spend at least twice as much to get an integrated amplifier that is significanty better-sounding.

Speaker power ratings are one step from meaningless. Just don't turn the volume up to where it sounds bad and you're good Your new amp will be fine with any speaker rated 4 ohms and up.

Btw, people tend to think that different cable constructions, and resulting higher prices can make cables that sound better, or not. I am one of the not.

As commsysman mentioned, you can get the quality you need from Monoprice, or if you want to spend some more money (like 30-40 bucks or so), but still at a reasonable price, order custom cable made up to your desired length/configuration from high quality commercial wire like Beldon, from my favorite cable co, bluejeanscable.com. Terminations are primarily personal preference depending your needs. And I do want to note here that Blue Jeans Cable now offers ultrasonically welded terminals in both bananas, and now several angles of spade connectors. These should be great.

Sorry for the lack of hotlinks in post, too lazy from my phone

The variety of competing opinions on cables mean (in the end) that there are small differences between them.  Some people cannot hear any difference, and those that do hear a difference usually admit that differences are fairly subtle.  So don't worry about stranded vs. solid.  That's an esoteric debate, appropriate for more expensive systems.

BTW, I like and recommend B&W speakers.  Just so you have another opinion on that.