$55: Would you risk your stack at lvl2 + call an all-in with 16 outs?

[AA suited]

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">HERO (t955)</font>
UTG+1 (t965)
MP1 (t1100)
MP2 (t2450)
<font color="#C00000">MP3 (t870)</font>
CO (t895)
Button (t930)
SB (t885)
BB (t950)

Preflop: HERO is UTG with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">HERO raises to t60</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">MP3 raises to t90</font>, CO calls t90, <font color="#666666">3 folds</font>, HERO calls t30.

Flop: (t315) T[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
HERO checks, <font color="#CC3333">MP3 bets t780 (All-In)</font>, CO folds, HERO ???


No reads because of multitabling, but from experience, this type of play smells of a draw bluff (straight or flush).

flush=9 outs
gut straight = 3 outs
2 overcards = 6 outs

= 18 outs

live outs = 16 since i put him on a draw

What would you have done? and more importantly, WHY?