Interesting hand with AK

[GrekeHaus]

Here, I'm sitting in the big blind. normally I'd raise here, but with all those people already in and me out of position, I decided just to call. I was wondering what other people would do in this situation.

Party Poker 5/10 Hold'em (9 handed)

Preflop: Hero is BB with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="CC3333">UTG raises</font>, <font color="666666">3 folds</font>, MP3 calls, <font color="666666">2 folds</font>, SB calls, Hero calls.

Flop: (8 SB) 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="blue">(4 players)</font>
SB checks, <font color="CC3333">Hero bets</font>, <font color="CC3333">UTG raises</font>, <font color="CC3333">MP3 3-bets</font>, SB folds, Hero ???