I like the sound of the AKG hypers better than the AKG cards... definately a more focused sound without a lot of extra crap. Also, I really like the frequency response of the AKG hypers moreso than the other hypers, with the schoeps a close second. I do not like the neumann ak50 hypers, but some people love 'em. Never heard the MBHO's before, I'm not sure too many people run them.
I find myself running hypers exclusively in arenas, and in crappy sounding rooms that are longer than they are wide. I don't think the hypers sound good up close except in very large rooms; if I'm close in a small club or bar I feel like I have to use the cards.
+T for new toys!