Should I put it all-in?

[JonLines]

Ladbrokes $45k Guarenteed $100 rebuy tournement. 250 started, 125 left, top 20 places pay.

Hero 6k
Villian 4k

Blinds are 150/300, Folded round to small blind who raises 900. Ive seen him make this raise more than its fair share since the blinds have gone up. I am going to re-steal to affirm my place on the board, and put villian in his place. Do i make a re-raise, if so, how much, or do i go all-in?