I don't use torrents at all any more, but when I was on Windoze I was frustrated with BitTorrent, and used Azureus for a time (cool program but maybe it's overkill with too many features). Then I settled on the lean and mean ABC (Another BitTorrent Client):
http://pingpong-abc.sourceforge.net/
This is a good bittorrent client program: very small and easy to configure. I think it's the best.