Also consider the PSB Image B25s for $320/pair in closeout.
http://www.stereophile.com/standloudspeakers/1204psb

Yeah, I should think the world's your oyster for being able to audition equipment. Since the speakers you mention seem truly entry-level do consider used as well.

My first thought when reading about the old Mac gear was to consider getting it refurbished sometime. Send it straight to Binghamton, unless someone else here knows of a worthy shop in NYC. Might even do it before splurging on more equipment like the turntable. Capacitors, resistors and so on will shift values over time.

Sorry if this isn't a very timely answer.

Usually people listen to speakers before buying them. Researching speakers on the INTERNET is like reading about sex. You can read every book treatise and research paper ever published but none of it will truly prepare you for the real thing.
My standard speaker advice is ------ Never, never, never buy any speakers without hearing them first.