Started this hand w/ approximately 27K (from 30K start stack). Villian in the hand is Brian Altman. I don't know much about him outside of him playing the majority of his hands since he arrived at the table a couple orbits ago. He's already 3bet an iso raise (and folded to a 5b limp shove) and called both 3b from blinds after he raised his button and CO. I've been playing solid and not really getting out of line due to some tough players on my left (dipthrong, kevin schultz, dan weinman 3 to my left).

I will say that with such a tough table none of these guys recognize me and are probably looking to play pots with me.

Blinds 150/300/50

I raise AA utg to 800, button calls, villian calls in bb
Flop (2850) - Kc7s2d - Villian donks 2200 I call, button folds
Turn (7250) - 8c - Villian leads 5200, I call
River (17,650) - 9s - Villian puts me all in and just barely covers. Me???

Thoughts on all streets and ranges here would be much appreciated.