Step 5 Hand versus GIGABET

[Lmn55d]

Hey I posted this in MTT too...not sure where it should go, but would like to get your opinions as well.

This hand was played in step 5 of party step tourney (2table). Blinds going up to 50/100 next hand. Villain is gigabet. Table is 6 handed, about 11-12 left in tourney. From my read, Gig is a very aggressive player who would make this raise with a wide range of hands. I thought that he'd fold a lot of the hands that would be close to a coinflip considering he was only getting 1.4:1 and because I had played very tightly, but I guess this last part of my read was wrong seeing that he called with JK. Was my push a good play?

Party Poker No-Limit Hold'em Tourney, Big Blind is t50 (6 handed) converter

Hero (t820)
UTG (t1065)
MP (t1255)
CO (t2200)
Button (t2500)
SB (t475)

Preflop: Hero is BB with 9[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
UTG folds, MP folds, CO folds, <font color="#CC3333">Button raises to t125</font>, SB folds, <font color="#CC3333">Hero raises to t820 (All-In)</font>, Button calls t695.

Flop: (t1665) 8[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Turn: (t1665) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

River: (t1665) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: t1665

Results in white below: <font color="#FFFFFF">
Hero has 9h As (high card, ace).
Button has Jh Kd (two pair, kings and jacks).
Outcome: Button wins t1665. </font>