TPNK vs maniac

The previous 4 times I got involved in a pot with this guy he would always come over the top of my bet to take the pot against my marginal hands and I was getting sick of it...then I had this hand and didn't know what to do.

UB $5+.50 SnG
Blinds 40/80

Hero t1500
UTG+1 t4500


Hero is in BB with K /images/graemlins/club.gif 8 /images/graemlins/diamond.gif

1 fold. UTG+1 calls. 1 fold. 1 fold. MP calls. 1 fold. 1 fold. SB completes. BB Checks.

Flop K /images/graemlins/heart.gif Q /images/graemlins/spade.gif 2 /images/graemlins/diamond.gif

SB checks. Hero bets 250. UTG raises to 800. MP folds. SB folds. Hero?

Go all in? IF your read is right he wont have a hand most of the time, if he shows over a good hand bad timing.