I'd go used on multiple high end 2 channel amps which can be had for a song in this economy. Save a bundle, and get real quality, 4 ohm stable components. Check amps from Yamaha, Harman Kardon, Kenwood. Flagship models form the late 70s and 80s are terrific buys.
I'd also consider used speakers for surround duty. If you can get your hands on some Mission 77ds surrounds for about $100 a pair you will have some great surrounds for another song.
It makes sense to get new full featured preamp/processors and DVD/Blu Ray players.
