Yeah, that's a sweet rig. I'd like to get a white avatar but knowing me I'd scuff the hell out of it in a week. Probably safer getting black...
As far as OD / distortion goes, I've been done this path on that mythical tone quest... went through a modded tubescreamer, DOD 250 overdrive, Pro co Turbo Rat, GK 2001RB's distortion channel, and tried a few more at stores... Ultimately, for a really nice overdrive sound, I settled on a Fulltone Bass-drive Mosfet. Very adjustable, very pleasing overall overdrive. However, it's not an insane distortion pedal. More or less based on a tubescreamer type of OD with a whole lot more flexibility. A lot of people also really like the EHX English Muff'n. If you really want a powerfully distorted tone I'd check out Gallien Krueger's Diesel Dawg (which is the same circuit as the 2001RB's second channel, with the addition of a very useful mid knob) or the Tech 21 XXL bass edition, which I haven't tried but people seem to like for heavy distortion. Also the AMT communist / capitalist pig series look awfully promising... Fuzz is another story, I won't even touch on that.