I had an ensoniq sd when they first came out great board.......when it worked.

There is a difference between the board Best Buy sells under a different model number I looked into it a couple of months ago. Guitar center or musicians friend has them for the same price as best buy. I don't remember what the difference was and I ended up buying a midi controller so I didn't get either one.
Listen to it see if it has the sound quality you want.