utorrent some times bitcomet
i use only Utorrent.
utorrent me too
Deluge here, mostly for it's fantastic web-ui and it's good default settings. Used transmission before that, but that seemed to "clog up" my router after 24hours of serious seeding.
When i started using Bittorrent like 7 years ago i started with Azureus(Vuze) and never changed a client since than :D