limewire is the best file sharing client out there.
It has no spyware with it, and it is efficent. The only thing you need is some A/V and some common sense. You can pick up spyware on it by downloading stuff, but that happens when people think they are download Half Life 2 and the file size is 512kb...... So always check file sizes, if they are small, it is nothing but spyware/junk.