OK, I thought we were ahead here too. At the time, I did not think about how to best play this. I was too stunned by the bet/situation, that I thought about it too long, and I just called. In reflection, I realize now that this is the best move. As pushing gives our villain a reason to fold. Calling gives our villain an opportunity to fire his remaining stack on the turn.
My reason for posting is that I'm starting to get a feel for some really strange situations lately, and am starting to get a better sense at really following my read. I'll post another hand in a moment as an example. I just don't think an ace bets this way here.
For those that are interested, here's how it played out. Results in white if you care.
Party Poker No-Limit Hold'em Tourney, Big Blind is t150 (8 handed)
FTR converter on zerodivide.cx
Button (t515)
SB (t1405) <font color="white"> SB has Jd Kh </font>
BB (t630)
UTG (t485)
Hero (t1540)
MP1 (t1225)
MP2 (t825)
CO (t1375)
Preflop: Hero is UTG+1 with K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">
1 fold</font>, <font color="#CC3333">Hero raises to t450</font>, <font color="#666666">
4 folds</font>, SB calls t375, <font color="#666666">
1 fold</font>.
Flop: (t1050) A[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t500</font>, Hero calls t500.
Turn: (t2050) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB bets t455 (allin), Hero calls t455.
River: (t2505) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Final Pot: t2505