Totally agree with j2buttonsw. Limewire is not excellent, but good for certain things. You would need the pro version to give a reasonable speed, and an extra 120mb to download Javascript which it also needs to run. It's also full of viruses so be warned. If you still want to try P2P then DC++ is excellent and 99% virus free. It's a little slower as it doesn't use bit torrent technology.
But hey, look at www.mp3sugar.com. Tracks cost 10cents and an album for 90cents. And your'e not tied to the site where you lose the songs. Is that a bargain or what!