Mid Pairs ITM in 55's with low blinds

[Pudge714]

I had playing aggressively, but not super aggressively
FullTiltPoker Game #225104925: $50 + $5 Sit & Go (1434387), Table 1 - 100/200 - No Limit Hold'em - 16:56:52 ET -
Seat 1: Coug MJ (3,485)
Seat 8: Hero(4,540)
Seat 9: korjae (5,475)
phil_ivey41 posts the small blind of 100
korjae posts the big blind of 200
The button is in seat #1
*** HOLE CARDS ***
Dealt to Hero [9h 9c]
Coug MJ folds
Hero raises to 600
korjae raises to 1,800
Hero?
Also what is a good general line for these types of hands? What is a good repushing range? What should I be folding? Should I be calling or stop and going? Obviously this is very read dependpent, but I would like to hear what most people do here.