Sunday PP 150

currently about 60 people left out of 300+, i have 11k in chips (second in tourney) and villian is the chip leader(sitting right next to me)...villian has been super loose aggressive...won on a couple of awful suckouts...

blinds are 150/300

folded to villian in small blind who raises to 600...i call with 5c6c...i basically credit willian with any two cards...

flop comes 7s 7c 9s

villian bets 900, i call

turn is the pretty 8h

villian leads out with 1800...what do you think is the right increment raise?