[rberg]

without a read, i dont assume a 40/20 will try to push me off a better pp than his in a reraised pot.
As played i'd probably fold the turn and def. the river.
If you plan on calling his turn bet, then i'd prefer a b/f, cause it gives you better idea what's going on for your river decision, what is more important with a pot this big than to squeeze value out of a smaller pp (which most people check behind on the turn anyway)