Personally, I've always found Polk speakers to be overly warm sounding and lacking in high frequency extension. I've never had a chance to hear the Epos but they've gotten very, very good reviews so they are certainly worth a listen. Other brands that make products in that price range that I recommend checking out would include Paradigm, Energy, and PSB.

the paradigm atom speakers sound quite good, and are well reviewed.

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1251981726&/B-W-DM17-Limited

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1251848272&/Heybrook-HB2

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1251734436&/Rega-R1-bookshelf-speakers

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1252179828

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1251228611

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1250833515&/Usher-S-520-beautiful-finished

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1250800385&/Tannoy-Sensys-DC1-maple

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1250525075&/Energy-Veritas--v2.1

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1250171903&/Soliloquy-5.0-bookshelf

http://www.audiogon.com/cgi-bin/cls.pl?spkrmoni&1249946488&/Kef-Reference-102

etc.

The impedance rating issue does not play out as being problematic or of any real concern, here.

Unless you can pick up the quads in person, it's not a good idea to trust someone with a zero seller rating. If you are a frequent eBay user, then you might have handle on how to go about making sure you aren't ripped off. I'm not saying the person is dishonest, it's just always best to be careful with new sellers. Seriously careful.

As in: 'never let the money get out of your sight for even one second.' Watch for any tiny sign of a 'bait and switch.'