Your using about the worst torrent you could use.
Azureus is the best because of its plug-in's. Offering much more usability then any other, although it can be a bit of a memory hog if you have a slow machine.
uTorrent roxx as well, small and very little footprint on your memory. But doesn't have near the functionality that Azureus does. I won't use anything but Azureus, I have tried them all and like it best.
Its kind of like FireFox, sure firefox can be a bit of a memory hog - but its extensions more then make up for it. And with 2 gig, it doesn't effect even the most hardcore game like Quake4 or FEAR by running in the background.