The subs are going to have their own amplifiers built in, 5 channels was this for a theater or a music 2. ch. system? I was thinking this was thinking this was a music only system.
Check out emotiva for your amp needs, buy what you can afford, the xpa5 is a great amp for 5 channels under $1 per watt... I own the amplifier and it is a work horse, for 2 channel music the xpa2 is amazing, and IMO about the best value amplifier in home audio, it sounds incredible... On the less expensive side there are avrs out there for under $500 that will power most bookshelfs on the market with no trouble, but to me I always like to see separate processor and amps in mid to high end systems...
If I were building a 2.2 system and was not worried about cost but building something I could afford, I would go with...
Ascend sierra towers
HSU ULS15 dual drive
ULS-15 DualDrive Packages
Emotiva XSP1 receiver {this has built in crossover control so you can play with the cross point with just some twisting of a knob}
Emotiva XPA2 amplifier
in black with all the cables that will cost way under $6000 and sounds incredible in pretty much any room, I know someone with the identical setup that I designed and its AMAZING, VERY powerful!!! Clean clear warm and STRONG.... But its also over $5000, some people dont spend that on cars...
Heres a pic of my 2.2 system... I had a custom crossover set made after trying a few different combos, but my budget was under $2500, and I bought a lot on sale obviously since just the msrp on the two towers was almost my entire budget... But the above system is the only thing I have heard that I like better than what I have... Sadly I would have to go woodgrain since my wife has a no black speakers rule and that would add around $600 to the price..... Don't get discouraged, finding the rite equipment is just as fun as playing it...