FTP 55K: AA against loose maniac early

[bluesbassman]

Villain is phat_cat, who I read as a loose donkish maniac. He could have almost any two here; should I shut it down on the turn because he hit two pair or something, or commit myself to this pot and bust his A-rag?

Full Tilt Poker No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) Hand History converter Courtesy of PokerZion.com

UTG+1 (t2900)
MP1 (t3370)
Hero (t2970)
MP3 (t2910)
CO (t3110)
Button (t2970)
SB (t2770)
BB (t3000)
UTG (t3000)

Preflop: Hero is MP2 with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">UTG+1 raises to t100</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t300</font>, <font color="#666666">5 folds</font>, UTG+1 calls t200.

Flop: (t630) 6[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG+1 bets t300</font>, <font color="#CC3333">Hero raises to t900</font>, UTG+1 calls t600.

Turn: (t2430) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG+1 bets t1700 (All-In)</font>, Hero ??.