AA hand....line to get the most chips in?

[Art Vandelay]

Party Sunday 100K freeroll (20K points entry). Read on UTG is fairly solid player. He steals, but it appears only in position. MP1 had just been moved to the table so no read on him. Blinds are 150/300, ~350 out of 2400 remain.

Side note: I very recently started reading the MTT tourney and already I feel like a different player. I was once a weak tight survivalist but now I'm trying to transform into an actual player who eyes the final table instead of the bubble. Thanks for the info and I hope to become an active contributor.

Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (10 handed)

BB (t3502)
UTG (t15661)
UTG+1 (t2272)
UTG+2 (t6200)
MP1 (t6525)
MP2 (t9130)
MP3 (t1340)
CO (t7080)
Hero (t14687)
SB (t12570)

Preflop: Hero is Button with A[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img]
UTG raises to t900</font>, 2 folds</font>, MP1 calls t900, 3 folds</font>, Hero ??

I initially thought about pushing but that seemed like too big an overbet. Then I thought about popping it to ~2k. Figured the absolute worst thing I could do is just smooth call (well I guess the ABSOLUTE worse thing is to fold but you get the idea). Any advice/thoughts appreciated.