Atari 800XL - Games I must play before I die

[Badders]

OK, as the title suggests, I'm looking for a list of games to play on my 800XL that are simply essential.

What exclusives were released for this machine? I have several games on this machine that I also have on the C64 and I find there's very little difference between them. I think the 800XL has a slight edge graphically, but nothing can beat the C64's SID 

Basically, what should I play on this machine that wasn't on the C64 also?

Cheers,

Pete.

[Rorshach]

There is a space action game called "gauntlet" I believe which was specific to the Atari 8bits which is quite good. It was shareware when released. Another I heard many people like was "Dandy". I must go through my old disks to find the names of some others I liked.