Most ppl don't seem to understand a very simple thing: there's a certain type of sound for every music genre so it's nothing wrong to ask "which is best for...". HOWEVER not not so many ppl know "that tone" is not coming from the bass alone, but it's a combination of bass + amp + cabs + effects - it's something you learn after experimenting for years with various rigs and instruments and not all ppl can achieve that kind of knowledge - but hey, it's easier to make fun of the guy instead of actually helping him for a change, right? I'm getting so sick of this attitude...
@OP: every piece of gear you use has an impact on your tone - yes, even the pick (different thickeness & mats will make the pick sound different). But it's all down to personal preferences - whether you like a more traditional or a modern tone, how do you feel about using some effects or no effects at all, and so on. Last, but not least, your technique is critical.
You can play metal on almost any bass or brand (yup, even on a Jazz). But from my personal experience, I'd say Ibanez (especially the SR, SRX, BTB lines), Warwicks (you can find a good SH W in your price range), MMs are great choices. ESP & BC RICH too...there are a lot of choices, really.
Again - depending on your tone preferences - Ampeg, GK or Ashdown amps will help you build a solid rock tone.
Cabs...this is tricky...you will need to get your bass & amp to the store and test a lot of 'em until finding the ones that will help your rig sound the best.
As for effects...a lot of players like a bit of overdrive in their tone, to make their bass stand out. It's not mandatory, of course, but it can help.
