AKs facing re raise shove from TAG

Still early and not sure if I made right decision. 1200 to call to win a 2000 pot. If I lose, I have 5BBs left. I've played some with this guy. He's a bad player but, really tight.

Full Tilt, $2 Buy-in (40/80 blinds) No Limit Hold'em Sit'n'Go, 8 Players

Hero: 1,900 (23.8 bb)
tilda88: 1,575 (19.7 bb)
Deganel: 1,410 (17.6 bb)
Aegis HK: 2,065 (25.8 bb)
Stam31: 1,260 (15.8 bb)
SBerlynas777: 2,300 (28.8 bb)
prado cash: 1,570 (19.6 bb)
KS KS KS KS: 1,420 (17.8 bb)

Preflop: Hero is CO with A K
Stam31 folds, SBerlynas777 calls 80, 2 folds, Hero raises to 320, tilda88 raises to 1,575 and is all-in, 4 folds

Results:

Spoiler:

840 pot
tilda88 mucked and won 840 (520 net)