Stars $30 DS ITM AQ hand

[Double Straddle]

Villain in this hand is the table chip leader. I didn't put him on AA. Once earlier with AA he smooth-called my EP raise. I see him making it about 18k here with AA or KK, so given that information, what do you think Villain's range is here, and do you call?

PokerStars No-Limit Hold'em Tourney, Big Blind is t2000 (9 handed) internettexasholdem.com

MP1 (t145061)
Hero (t40668)
MP3 (t70885)
CO (t265842)
Button (t82014)
SB (t18472)
BB (t24847)
UTG (t23909)
UTG+1 (t43845)

Preflop: Hero is MP2 with Q[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to t6000</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">CO raises to t52000</font>, <font color="#666666">3 folds</font>, Hero ???