If you are looking for a new BitTorrent client, then avoid Vuze. It used to be a superb client but recently they switched to the malware model. Last update it infected all my broswers with redirecting ad ware. My search engines were all set to Yahoo and it installed multiple extensions. It was painful to remove it all.
I'm not making this up since the company fully admits they do this on their own forum web pages. Well they don't use the word malware, but if it quacks like a duck.