What would you do?

I was in a poker room at Atlantic City and the following came up against me and the chip leader. It was a 5/10 NL and the chip leader raised it to 25 and 4 ppl incl myself called. I was holing AJ and the flop came J,6,8. I checked and he raised it 125 to go everyone around me folded and I raised him to 250 to call, he called and the turn was a 8 making the board J,6,8,8. I checked and he looked at me and said all in. I was thinking in my head what would he have? AA KK QQ I did not think he had because of the small pre-flop raise. mayeb TT or 99? After thinking it over for about a min i decided he had TT and called my 700 sitting and front of me and he flipped up JJ. I was shocked and hit myself in the head for not considering his set of JJ. How did I play this wrong or was it just a really hard decision?

Your read was off. You can't put him on TT there becuase of his flop pot and his call of the 250 on top.

He played it well on the turn.

Beyond a bluff, you arn't betting any all in hands there. It's a great bluffing spot/pot but you'll be really hard pressed to call 700 more only beating a bluff.

-'rilla