Marshall AVT100, Peavey Valveking 112 or Vox AD50VT?
I play anything from Gary Moore type blues through Metallica to In Flames, mainly bedroom volume or jamming with mates.
The Valveking will have a better sound quality as it is an all valve amp whereas the others mainly use transistors
depends on what you are looking for. the peavey will be better for rock/distortions, while hte vox will have better cleans
The Valveking by far
Try and get a used 5150/6505 combo though
ohai little sig.
The best way to pick an amp is bring your guitar to the store and try everything.

In the future, ask questions about amplifiers here.
Thanks - Peavey looks favourite so far, which I was leaning towards anyway. I tried all three today with my Jackson Bond Signature Rhoads - I own the AVT100 already and intend to upgrade with the Peavey, but I also tried the Vox and was fairly impressed compared to my AVT100. I play more metal than anything else. Haven't been able to find a used 5150 or 6505.