For affordable amps I've pretty much settled on Lanzar Vibe. Actually, I'm upgrading to Optidrive at the moment and my vibe 230 is on ebay right now for 49.99. I also have a 1200D that's doing a great job as well.
I just bought two Lanzar Vibe 225's for $250. They are pretty decent for the price. Check out http://www.nowonspecial.com for good prices on lanzar and other brands.
I have to second the US acoustics. they are pretty good amps for the money. JBL are also not that high priced. And they are good quality as well //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif