Are my calls with off-suit connectors correct?

[MagicRat]

This seems to be one of those situations that I find myself in quite a bit in the Big Blind so was wondering if I'm playing this correctly.

Party Poker 1/2 Hold'em (10 handed)

Preflop: Hero is BB with 8[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 calls, UTG+2 folds, MP1 folds, MP2 folds, MP3 calls, CO folds, Button folds, SB completes, Hero checks.

Flop: (5 SB) 9[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/club.gif[/img] <font color="blue">(5 players)</font>
SB checks, Hero checks, UTG bets, UTG+1 calls, MP3 calls, SB folds, Hero calls.

Called since I had middle pair, back-door straight draw and no flush draw on the board. Thoughts?

Turn: (4.50 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="blue">(4 players)</font>
Hero checks, UTG bets, UTG+1 calls, MP3 folds, Hero calls.

6.50 BB in the pot to me and I think (and that may be a stretch!) I've got 6 outs (7s &amp; 9s). Correct play?

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Also, would you call a hand like this pre-flop (no raises) if you're in the small blind??

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Thanks! [img]/images/graemlins/smile.gif[/img]