What is the best 6 piece sub/sat system under 2k?

You might want to check out Aperion Audio. They are a mail order only manufacturer. Their speakers use a new crossover technology that features a DiAural circut. Rave review from some of the more prominant audio publications. Their website is available through the Manufactures listing on Audiogon. No experience with them but they have good reviews, offer a 30 day return and seem to fit your requirements.

Look in eBay under Proton. Legacy audio is clearing their Proton five channel amp and preamp processor for $495. Decent. Also Wharfedale Diamonds SE 7.2 are being discontinued. Michaura is a speaker name that's been buzzing in HD and the Asylm.

I have the Aperion Audio 5.1 system with the 12" sub. The sub is very large but the satellite speakers are quite small. This is a super home theater set up as long as you have adequate power, at least 100 watts per channel. The satellite speakers aren't very efficient.

While I don't use mine for straight music listening I can say they have a very pleasing tonal balance and lots of dynamics. A very fine company, a pleasure to deal with. The bang for the buck is going to be real hard to beat.