[PS $50] Call this raise with the wheel despite the three-flush?

[NYCNative]

Read on villain: Villain hasn't gotten out of line but everyone at the table (including myself) is kinda LAGgy. I had only had to show down good hands thus except for a missed draw that I still won with the high card (checked down on the river).

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

MP3 ($26.15)
CO ($25)
Button ($53.90)
Hero ($84.25)
BB ($21.35)
UTG ($19)
UTG+1 ($50)
MP1 ($110.10)
MP2 ($22.60)

Preflop: Hero is SB with 4/images/graemlins/club.gif, 3/images/graemlins/club.gif. CO posts a blind of $0.50.
<font color="#666666">5 folds</font>, CO (poster) checks, <font color="#666666">1 fold</font>, Hero completes, BB checks.

Flop: ($1.50) 2/images/graemlins/heart.gif, 7/images/graemlins/spade.gif, 5/images/graemlins/heart.gif <font color="#0000FF">(3 players)</font>
Hero checks, BB checks, CO checks.

Turn: ($1.50) A/images/graemlins/heart.gif <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $1</font>, BB folds, CO calls $1.

River: ($3.50) Q/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $1.5</font>, <font color="#CC3333">CO raises to $5</font>, Hero...

[Thundercat32]

I'd be tempted to call here, but I think I'd have to raise probably to $15 maybe $20, if I get reraised than I fold, unless it's a minraise I call

[NYCNative]

Here was my logic:

I am getting 2 to 1. I don't think villain smooth-calls the made flush (unless it's the nuts) and I don't think he raises into my river bet (unless it's the nut flush). He was in the CO but he posted so he could have anything. However, if raising with a weaker flush here, he's also potentially doing this with a badly played set, two pairs or a missed flush draw bluff. So I called figuring, if nothing else, I can see what and if he slow-played, but that I might have a 2-to-1 shot of winning as well.

[Justaguy33]

Just call.