flop bottom 2 vs. nit nit ($100NL 6-max)

[ua1176]

$100NL 6-max @ FT.

villain is super-nit like 10/6 over 200 hands. i raise 54s in CO and he calls from SB. im running 20/16 over 120 hands at this table but villain just showed up so he wouldn't know that.

flop 754 rainbow. he leads 4/5 pot. i call.

turn offsuit 2. he checks....i bet $20 into the ~$25 pot,
he thinks for a few and calls.

river Q. he checks. i.....shove? or check? who raises flop? anyone check turn?

thanks,

jon