overpair flop decision vs TAG

[einbert]

My opponent in this hand had stats of 16.6/3.9/2.3 with a WTSD of 23 over 259 hands.

I felt I had to raise this flop to avoid letting draws see a another card cheaply, but I was totally puzzled as to what he held when he pushed on me. Will an aggressive player really play a set this fast? Would he really three-bet the flop with a lower overpair than mine (this seemed very unlikely to me)? 3[img]/images/graemlins/heart.gif[/img]4[img]/images/graemlins/heart.gif[/img] or 6[img]/images/graemlins/heart.gif[/img]8[img]/images/graemlins/heart.gif[/img] seem possible, but since I am a slight dog to these and a tremendous dog to a set it didn't seem like I have enough equity on average to make this call.

Help with regards to figuring out this guy's hand range would be most appreciated. Also what is my plan if he just calls my flop raise and checks to me on the turn? The board just seemed too draw heavy to give a free card, and the pot was going to be already quite large at that point.

Party Poker No-Limit Hold'em, $ BB (10 handed) converter

Hero ($204.4)
Button ($243.42)
SB ($197.7)

Preflop: Hero is MP3 with Q[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $1.
<font color="#666666">5 folds</font>, <font color="#CC3333">Hero raises to $8</font>, <font color="#666666">1 fold</font>, Button calls $8, SB (poster) calls $7, <font color="#666666">1 fold</font>.

Flop: ($26) 5[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $6</font>, <font color="#CC3333">Hero raises to $40</font>, Button folds, SB is all-in $140 more,