Looking for a Guitar to suit me and my style (See Details)?

I play metal/thrash/ guitar and I've been playing an Ibanez RG (with a fixed bridge) And I'm looking for another guitar with possibly lower action so I can do sweeps, taps, and radical leads but still maintaining heavy chugging rhythms. Also I like to constantly switch between tunings from normal to drop Bb and everything in between, so any suggestions? I was thinking about the Ibanez Xiphos bgecause of it's low action but I don't think down tuning with it is so great. Any brand is cool, I don't play much anything that isn't distorted :D