Laney VC30 for more metal-oriented grind...
Marshall DSL401 for more mid-range crunch...
Those are my preferences, but I like the tone Paul Gilbert, Maiden, AC/DC get out of their hardware more than Metallica/etc.
Head down to your nearest guitar shop and plug in for an afternoon. See which one you like best and go from there. For valve amps, don't be afraid to wind them up to about 5/6 on the Master Volume (this really will make your ears hurt) to see what they actually sound like - my DSL401 is a completely different amp once the power stage gets going.
I loathe that about amplifiers. Nobody needs to turn up to that volume unless playing live, and even then, nobody is going to be particuarly bothered by tone at an amature level.
The OP specified he didn't need it to be loud, so I would hesitate to recommend something that he will never make the most out of.