#mystery55 It is hard to guess what any player would do without additional information.  First, how deep were both of the other players with respect to the number of BBs? In answering this question I am assuming everyone involved in the hand is very deep as it is the first blind level.  I do not know Advoghado but I am going to guess that he flatted the 250 bet as there was no flush draw but a potential straight draw.

Personally i would have raised to 800 as there was a bet and a call bring the pot to 800.  I would have made this pot sized raise for two reasons.  It is early on in the tournament when people are still deep and a 1/2-3/4 pot raise most likely result in 2 calls which could lessen my equity depending on the turn card.  The main reason for the raise to 800 would be to try to isolate the bettor.  Granted if the bettor calls the other person in the hand could very easily call depending on the holding or if they are floating the flop.  Regardless, I would be trying to build the pot with this raise to maximize the amount of chips I could get with my flopped set.