1. Metallica - I listen to them more than any of the other three and their catalogue is probably the most diverse and serves different moods way better than the rest of the Big 4.
2. Slayer are a pretty close second, it helps that they're probably the most consistent and haven't ever released a truly bad album. Plus they influenced a lot of the extremer ends of metal, which I'm into.
3. I really like Anthrax's style, they're the band I'd most want to hang out with and I thing a lot of that comes through in the music.
4. Megadeth - Fuck Dave Mustaine.