Marginal play with K-J?

[Stretch_Plum]

I was playing in a small($60) buy-in tourney last Friday(70 players, top 7 get paid) and made it to the final 2 tables. Blinds were 500/1000 and I'm in the BB with about 7300 in chips. Action was folded around to Button who pushed all-in for 3600. SB folded and I looked down at K-Js. I'm pretty sure the button player has a weak Ace from having seen him make this move already a couple times before and getting called. If I call and lose, I'm down to 3700 and I'm in the SB next hand and the next blind level is a couple minutes away(1k/2k). I'm getting 2:1 on the call I figure I'm either a 3-2 dog to a weak Ace or about 6-5 against a small/med pair. I called and he flipped over an A-3 and his hand held up.

Did I make the right decision to call in this spot, or should I have waited for a better opportunity to push later with more chips?