25/50 live, weak combo draw, reverse implied odds, etc.

[ceczar]

25/50 live game in nyc last night, effective stacks here are 25k

i'm in the straddle with 6[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img], 6 people to the flop:
($600) 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img]
SB and BB check, i bet 500 quickly, folds to SB who calls (this guy gives a lot of loose action, but plays fulltime and is up huge in the game), BB makes it 2k (2+2er, really good player, imo he has a wide range and, and could be CR with made straight, pair+sd, fd, set, air)
i called (i think this is pretty standard, but i think an argument could be made for it being a fold because of reverse implied odds of both draws being so crappy and so easily dominated)

turn ($5100) 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] [4[img]/images/graemlins/spade.gif[/img]]
he thinks for a while and bets 3900, i think he follows up here with a fd most of the time, a straight all of the time, is giving up with air a lot of the time (a hand like 68 being a big part of my range) and is sometimes betting a set (the rest of the time ch-calling).
my range is also big enough on the flop that i will be folding many hands on this turn.

standard call? fold?
if you call, what's your plan for a river club? for a river blank?

villain and i have played quite a bit together live (he also plays a lot online), and also discussed hands together, and are reasonably familiar with how the other plays and thinks about the game. he probably thinks i call too much.