My line late near bubble SB vs. weak tight BB(Full Tilt $55)

[Rob Blackburn]

13 left 9 pays(6 handed atmy table), I should have a very tight image, I have showdown only 3 hands the whole tournament, AAx2 and KK once, other pots picked up all folded to my raises.

My Table: one maniac and rest weak tights, the maniac has revived a guy who was sub 1k all the way back to 8k, the past two hands. At the other table both short stacks have doubled up so chip stacks across both table are all in one clump 8k-14k range

I'm mostly wondering about my line on the turn though I will take critisicm for the pf and flop play I am sure they warrant it.

300/600 75 ante
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Hero(12,020): A/images/graemlins/club.gif 5/images/graemlins/club.gif Raise to 1200
BB(12,363): Calls

Flop: 2 /images/graemlins/diamond.gifA /images/graemlins/diamond.gifJ /images/graemlins/spade.gif
Hero Checks, BB bets 1800, Hero Raises 3600, BB Calls

Turn: 5/images/graemlins/diamond.gif
Hero Checks, BB bets 1800, ??????

My move?

Thank you for you time.

Hero pushes to make the nut diamond draw and possibly decent A pay and be happy if they go away - if he's already there I'll root for an A or 5 and say: "nice hand sir" when then don't show up.