Alright, so I'm looking to buy a new amp. I only have about $500 to spend. I play thrash metal, but recently I have been getting into power metal, progressive metal and melodic death metal.

I was originaly thinking about buying a Marshall or a Randall combo amp. I've tried some line 6 amps and I did't really like them for some reason.

Does anyone know which amps would be good for these genres?

Any help is appreciated.