Bottom two, better off heads up?

[Girchuck]

Online $2-$4
Very weak-tight table.
The only LAG is UTG, he raises and gets two(!) cold-callers and SB comes in.
I think about it but call two in the BB with K [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/spade.gif[/img]

The flop is A [img]/images/graemlins/spade.gif[/img] K [img]/images/graemlins/club.gif[/img] 7 [img]/images/graemlins/club.gif[/img]

SB checks
Is it time for check-raise that may trap some people or am I better off heads up against the LAG, in which case I should've bet immediately, and hopefully cleared the field.

Results:

I checked, LAG bet, one called, I raised, Lag called, caller folded.

On the turn Q [img]/images/graemlins/spade.gif[/img] (A [img]/images/graemlins/spade.gif[/img] K [img]/images/graemlins/club.gif[/img] 7 [img]/images/graemlins/club.gif[/img])
I bet, he raised, I re-raised and he capped.

River was a K [img]/images/graemlins/diamond.gif[/img]

I bet, he raised, I re-raised he called and I won.