No HH available from this site on a 10NL table; if I left any important details please ask. Assume ~100BB stacks all around.

I'm dealt 55 in the SB.

4 limpers, I complete and the BB checks.

Pot is $0.60
Flop 2c5c8d.

I lead for $0.40. BB raises to $0.80. One fold, 3 callers and it comes back to me with a sizable $4.20 pot.

Gotta raise here, but how much? I've got $9.50 left. Just push and probably take it down there? Raise to half my stack and then push the turn?