Whatever you do, DO NOT, buy a line 6 spider III. I don't care what ANYBODY says those things SUCK. Or a Marshall MG. Fender FM25 are pretty crappy if I remember correctly.
I always recommend the same amp I have, Fender FM65R (R for reissue). It's about 270$. So, a little bit more than what your looking for, but it's worth saving up the extra cash. The clean channel on that thing is like someone captured a piece of heaven and put it in the speakers. The Distortion isn't the BEST in the world, but it has a real classic rock sound. But if you already have a Distortion pedal, you can get a more modern metal sound. Also, the distortion sounds much better after you play with it and find your preference. Most amps are different, so it can take even a month to find the perfect tone for YOU.