Middle Pair With Gutshot

[charlie_t_jr]

I've only been at the table for a couple of orbits. UTG+1 has been in several hands. MP1 seemed fairly tight. No other reads.

Party Poker 2/4 Hold'em (9 handed)

Preflop: Hero is MP2 with K [img]/images/graemlins/club.gif[/img], Q [img]/images/graemlins/spade.gif[/img].
1 fold, UTG+1 (somewhat loose) calls, MP1 (somewhat solid) calls, Hero raises, 5 folds, UTG+1 (somewhat loose) calls, MP1 (somewhat solid) calls.

Flop: (7.50 SB) Q [img]/images/graemlins/diamond.gif[/img], A [img]/images/graemlins/heart.gif[/img], J [img]/images/graemlins/diamond.gif[/img] (3 players)
somewhat loose bets, somewhat solid raises

Ok, I have middle pair and the gut shot. What's my move?