i love my old xtant a4004. i've had a little ground loop trouble, but it is way underrated and delivers any kind of power i'd ever need. it states 50 watts x 4 @ 4 ohms, but it murders my alpine type R components at about 1/3 gain. i'm probably going to run some bi-ampable components with it in the near future.
edit: whoops. it's not really that small.