3/6 So many good options, but which one is best?

[Pog0]

3/6NL. 600 stacks.
I, 24/16 in CO w/ Q[img]/images/graemlins/spade.gif[/img]T[img]/images/graemlins/spade.gif[/img]
20/15 reasonable TAG on BTN.

PF: I raise to 21, BTN calls, blinds fold.

Flop ($51): 9[img]/images/graemlins/spade.gif[/img]Q[img]/images/graemlins/club.gif[/img]4[img]/images/graemlins/diamond.gif[/img]

I bet $42, BTN calls.

Turn ($135): 4[img]/images/graemlins/spade.gif[/img]

I... ($535 each to play)