Bubble question???

[X-Man]

$15+1 Turbo on Stars.blinds are at 300/600 ante 50

Seat 5: XXX69XXX (1840 in chips)
Seat 6: chulita (3420 in chips)
Seat 8: disa (595 in chips)
Seat 9: DeadMoney61 (7645 in chips)
XXX69XXX: posts the ante 50
chulita: posts the ante 50
disa: posts the ante 50
DeadMoney61: posts the ante 50
chulita: posts small blind 300
disa: posts big blind 545 and is all-in
*** HOLE CARDS ***
Dealt to XXX69XXX [8d Ah]
DeadMoney61: folds
XXX69XXX: raises 1245 to 1790 and is all-in
chulita: folds
*** FLOP *** [7h Kh 2d]
chulita said, "k j"
*** TURN *** [7h Kh 2d] [Js]
*** RIVER *** [7h Kh 2d Js] [Qd]
DeadMoney61 said, "lol"
*** SHOW DOWN ***
disa: shows [3s 7c] (a pair of Sevens)
XXX69XXX: shows [8d Ah] (high card Ace)
disa collected 1590 from pot

My question is should i have gone against the allin short stack or left them to the SB who had a decent stack(and as it turns out would have knocked them out)or was i right to try and build my stack with A 8 and the chip leader out of the picture,I was pretty sure middle stack would fold.BTW I busted out 4th OOTM [img]/images/graemlins/confused.gif[/img]

[Kurn, son of Mogh]

Your raise is correct. The blinds and antes represent a 60% increase in your stack size. A8o wins about 64% of the time against a random hand, 66% against what he held. Wait for a better shot? Might never happen.

[X-Man]

Thanks Kurn,I knew i was favourite but thanks for the percentages and reasoning.