I have two 1.5 TB green drives (WD15EARS) and they work fine and operate quietly. Though the computer they are in isn't turned on all the time, after 10 hours or so of heavy use they are still cooler than my Seagates. Both have a very low flow (inaudible from a few feet) 120 mm fan blowing over them.
Yup too true. The strictest trackers I'm on limit clients to utorrent, rtorrent and whatever the most popular Mac client is.