d% or d1000 for me. Yeah, I use the d10s for that, but not as d10s. Sort of different. After that it's gotta be my d24 (because BBEG's deserve the title.)
Currently its the d4, as my current character is running around with daggers, lt. pick, lt hammer, and is a ranger and those are light weapons. But in the past its been d6s d8s and d10. Alas the lonely d12 barely gets rolled.