Apple has updated it’s Mac Mini. For $599 or $799 you either get a dual core i5 or a quad core i, though with only the intel Graphics HD 4000 for graphics. And for $999 you get the server version with 2 hard drives and Mountain Lion Server.
Still a very powerful desktop computer in a very small size, though not for CUDA unless you added a thunderbolt expansion chasis for way too much.
Impressively this can also be built with a Fusion drive for added speed.