What do you all use?

I've been using Azureus, but lately I've been having a lor of problems with it. I'm trying the official client and it kinda sucks

Wish I could help you, but Azureus is what I use.

Oh, and:

i use bit tornado, works pretty well. nice and simple. though probably doesnt work as well if you have more than 1 or 2 torrents open at a time.

azureus all the way

I use ABC

ABC is a nice alternative to azureus. not as much of a resource hog and more or less the same features.
i'm not, however, sure if ABC has a plugin akin to the safepeer plugin for azureus. Not that i would expect you ever download anything where you'd need to block IPs for any reason, nor would i condone such activities.