-Wide Variety
-Sounds good
-Cheap.
You cant have all 3 of em. Pick 2.
Anything with a wide variety and is cheap isn't going to be on par with stuff like east west, etc... and most stuff that sounds good is individual, or if its multi instrument and recorded/sampled good, its going to be expensive. I believe you're looking for something that probably doesn't exist. If we're all going by the same standards of 'sounds good'.