I heard about this site (wikiloops) just a few days ago, is it really good? I've only found a couple of good recordings, people see it more as an informal jam, right?
Either way this is full of awesome riffs. What guitar do you play?
Wikiloops is a great resource! The recording quality varies a little because of its informal/collab layout, but you can find some real diamonds in the rough over there. One user for example, Shumdrummer, is a goldmine of interesting and high quality metal beats. Hearing alternate versions of the same tracks by different people is great for scoping out ideas, too.
I use an Aria Stratocaster 714-STD. It's pretty affordable, but I've found cranking it through a Vox Stomplab can yield some nice tones :)