If you have a home network, simply turn on the file sharing on PC and it should appear on ur mac'c finders sidebar as a windwos SMB server..U can simpl copy your stuff from your folder...This mehtod would take a lot of time if your network is not fast enough..But it'll save u a few DVDs for sure..
ANd yeh there are few Torrent Client for mac as well..
This is the one I use..
Transmission
Cheers..