AA hand. What do I do on turn???

Villian is 22/7 for 116 hands. Don't know post flop AF. I think he's either got a set or a flush. I was leaning toward flush. Knowing that, can I call hear w/ only half his stack remaining? I have decent redraws, but not great odds. Help me, please?!
Party Poker No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

Hero ($252.45)
MP3 ($60.65)
CO ($103.20)
Button ($91.50)
SB ($77)
BB ($85.61)
UTG ($118.70)
UTG+1 ($147.30)
UTG+2 ($114.40)
MP1 ($65.35)

Preflop: Hero is MP2 with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.50.
<font color="#666666">1 fold</font>, UTG+1 calls $1, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $5</font>, <font color="#666666">3 folds</font>, SB (poster) calls $4.50, BB calls $4, UTG+1 calls $4.

Flop: ($20) 3[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, UTG+1 checks, <font color="#CC3333">Hero bets $15</font>, SB calls $15, BB folds, UTG+1 folds.

Turn: ($50) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $25</font>, Hero ???

[Maulik]

flop: pot it.
turn: push, you've got the re-draw and if a 4 falls you should chop.