If you want to be legal, you are going to have to spend money. You can realistically hope for the best
legal collection if not the best collection. If someday the piracy hammer comes down, you should be well-positioned.
As I posted in his thread, if I had to start over again and I was in a rock-oriented area, I'd probably opt for the GEM as my base:
http://www.soundchoicestore.com/gem-ser ... pg-66.html
Then fill in other stuff with custom downloads and CB artist disks. 6000 top-quality songs costs $4480. Add another $1000.00 or so and you have a pretty recent top-quality library. You also avoid the long "ripping" process you have with disks.
If I didn't like the lease approach, or was in a heavily country area, then I would pick up Foundation I & II, then CB Essentials 3-10. That's about $2000, and gets you 4500 songs. After that, I would fill in with artist disks for country, Zoom/Sunfly/SBI downloads for recent and rock, and CB or SC customs. For $3000, I could get a pretty decent selection of songs to match the GEM. If you have a lot of country singers, Chartbuster is about as good as Sound Choice if not better for that purpose. And the GEM series is at best adequate for country selection. It skips some pretty big acts and hits in that area.