Stars $3+RB K-Qs interesting hand

[Semtex]

PokerStars Tournament, Big Blind is t1200 with t75 antes (9 handed) Converter on pregopoker.com

UTG (t33717)
UTG+1 (t91387)
MP1 (t25342)
MP2 (t41155)
MP3 (t19398)
CO (t16510)
Button (t18226)
Hero (t40239)
BB (t34144)

Preflop: Hero is in SB with Q[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="red">MP3 raises to t2400</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, Hero calls t1800, <font color="gray">BB folds</font>

Flop: (t6675) 7[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/heart.gif[/img] (2 players)
Hero checks, MP3 checks

Turn: (t6675) 4[img]/images/graemlins/diamond.gif[/img] (2 players)
<font color="red">Hero bets t5000</font>, <font color="red">MP3 raises to t10000</font>, Hero calls t5000

River: (t26675) K[img]/images/graemlins/club.gif[/img] (2 players)
<font color="red">Hero bets t7000</font>, MP3 calls t6923 (All-in)


I had just been moved to this table. Comments on all streets would be appreciated. I couldn't decide whether to reraise the min raise preflop, ended up just calling. After he checked the flop and min raised the turn I was positive he was pretty strong (7-7, 4-4, or A-7, maybe A-A, K-K or A-K) so I had no fold equity for a push, however I was getting a little better than 4-1 so I called trying to hit the flush. Seeing as how he was committed I reasoned I could save some chips if the flush missed. The river messed that plan up. How should I have played this river? Overall, with my comfortable chip position, is it even worth it to get involved in hands like this when I have no feel for the table yet?