Funny thing is you can often tell if a file's poisoned or not.

When a dozen results turn up with different file names, but exactly the same (and ridiculous) file size, you know something's fishy.

If not utorrent, then possible bittorrent. Last time I used that, it had a nice integrated search function built in, with some rather well known torrent sites. The preview feature has never worked for me, but I can imagine it to be handy when it does it's job.

I stand by my first opinion though, utorrent is all you'll need. Just go to their homepage, and read their FAQ. Most questions can be answered there.