Line 6 Spider 3=Great modeling, 15w is $100
Marshall mg=simple 2 channel amps, not too bad.
Crate- Some amps with ok tone, 15w for like $80!
Vox- I don't really like the Vox's non-tube amps, but there ok.
I have a micro-cube, and it's probably what i would recomend. I think it's 8w, but it can get loud!
Someone mentioned the guitarport. I have one, and truly, I love it. I dont use my microcube too much, so I use that. I just ordered a marshall vs265, which are good if you wana look on ebay. Once I get that though...oh...ya...
"When you want to rock hard children, lean of F#."