If you were looking for an additional 64 voices to add to your sequencing rig, and editting sounds wasn't your biggest concern, which would you choose; 1) used QSR for $250 or 2) used Nanosynth for $125.
If you already have a midi keyboard or a killer sequencer the nano is definatly the way to go. It has many good sounds. I have added e-magics sound diver 3 for editing sounds or just making up new ones.