50NL: AKs - How do I get to valuetown?

[thing85]

Villain is 39/20/5 over 70 hands.

Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

UTG: $44.80
Hero (MP): $78.35
CO: $62.55
BTN: $49.25
SB: $101.50
BB: $111.40

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] dealt to Hero (MP)
UTG folds, <font color="red">Hero raises to $2</font>, 2 folds, SB calls $1.75, BB folds

Flop: ($4.50) Q[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $3</font>, SB calls $3

Turn: ($10.50) 7[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $7</font>, <font color="red">SB raises to $20.50</font>, Hero...?


Villain plays this aggressively, but how can I extract the most value here? Keep in mind we're both a little bit deep in our stacks. Do I wait until the river to get it in, or could another diamond kill my action? Or do I get it in on the turn? If not, what's the appropriate raise?