I second the vote for Hifonics amps. I'll be running one at 450Wx1@2ohm for my sub and another at 100Wx2@4ohm for my fronts. Just waiting for the front amp to get in then I finish off my system. Great prices and better sound than RF. If you want to risk getting them off e-bay, you can get some awesome prices.
As a warning, DO NOT order from soundhabits.com. Bunch of rip offs. Ordered an IDQ12DVC4 from them 2 weeks ago. Charged my CC, then they tell me it's on backorder, they're waiting for their IDQ shipment to come in. Finally got them to give me a refund, says it'll go through in 7 days. From now I'll do everything in my power to get people to stay away from soundhabit.com. Order from mmxpress.com, the owner frequents the newsgroups and gives great advice.