UI overcards--check the turn?

[ellipse_87]

Found this in my HH from last nite. No notes on these players.

PokerStars 0.25/0.50 Hold'em (10 handed) converter

Preflop: Hero is MP1 with K[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, MP3 calls, <font color="#666666">2 folds</font>, SB calls, BB calls.

Flop: (8 SB) 7[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, MP3 calls, SB calls, BB calls.

Turn: (6 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP3 raises</font>, SB folds, BB folds, Hero calls.

River: (10 BB) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP3 bets</font>, Hero folds.

Final Pot: 11 BB

On the flop, I've got 6 good outs. Three to one to win the hand, 3 others in; bet.

Turn: Roughly 7-1 to hit my outs, might win the hand UI, but doesn't justify a bet; should've checked. MP3 bets: 7BB pot so far, assume others fold. Okay getting 3-1 to see showdown? Or fold to probable straight (65/T9), set, or 2-pair (87s)? Does anyone at .25/.50 bluff when an 8 falls on the turn, or bet a non-face-card middle pair? Why am I calling this?

River: Why am I folding an 11BB pot? Is the likelihhod of a bluff less than 8.5%? Actually, yes. Fold.

I should have check-folded the turn. Right?