$5 BB Vs. SB with middle pair

[SteveM]

Villain hasn't gotten too much out of line so far, but we're still early, so reads are not good. A few hands ago he limped KQo in EP, then called (after 2 others) a 3.5xBB push from a shortie. Postflop he made a pot-sized bet with 2nd pair after the other two guys checked it to him.

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t20/t40
8 players
Converter


Stack sizes:
UTG: t1125
UTG+1: t1820
MP1: t1605
MP2: t1500
CO: t1305
Button: t2930
SB: t1760
Hero: t1455


Pre-flop: (8 players) Hero is BB with K[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/club.gif[/img]
6 folds, SB calls t20 (pot was t60), Hero checks.


Flop: K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/heart.gif[/img] (t80, 2 players)
SB bets t80, Hero...?