Flopped Set at 5-10

[Jeffage]

5-10 game with a 1k min and 3k max buy-in. I'm sitting with about 1500 and open for 35 in the cut-off with 55. Only the SB calls - he is a young guy, seems tightish but not a rock. I overheard someone say he makes moves occasionally but I've only been at the table like 15 mins. He has about the same amount as me.

Anyway - flop is J[img]/images/graemlins/heart.gif[/img]5[img]/images/graemlins/club.gif[/img]2[img]/images/graemlins/spade.gif[/img]. He bets 50 into me, I decide to just call. The turn brings the 10 [img]/images/graemlins/heart.gif[/img]. My opponent now hesitates for a second and bets out $325, a big overbet. Your play? I planned to raise, but what's a good number? Anyone just call or raise flop instead?

Jeff