I have run both, observations.
AKG's - You get both hypers and cards in 1 package, internally powered and shockmounted, big as a billy club it seems, which makes it a bitch to put on a smaller stand.
853's - Multiple caps cheaply available including omni's, nicer sound than the 1000's in my opinion but only with phantom, ready resale when upgrade time comes.
I would go for the 853's they make some impressive tapes, i've been thinking about picking up a pair again to toy with. If you have any specific comparison questions i can try and help, I know many people have run them both i think.