How much to bet with mid-pair?

[IcyHotMonkey]

Do you check or bet this? And if you bet, how much? No reads, new table.

PokerStars Tournament, Big Blind is t400 with t25 antes (9 handed) Converter on pregopoker.com

UTG (t12105)
UTG+1 (t19675)
MP1 (t40016)
MP2 (t8250)
MP3 (t7071)
CO (t18147)
Button (t3005)
SB (t25434)
Hero (t13792)

Preflop: Hero is in BB with 2[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/heart.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="gray">MP3 folds</font>, <font color="gray">CO folds</font>, Button calls t400, SB calls t200, Hero checks

Flop: (t1425) 4[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/spade.gif[/img] (3 players)
SB checks, Hero checks, Button checks

Turn: (t1425) T[img]/images/graemlins/spade.gif[/img] (3 players)
SB checks, <font color="red">Hero ????</font>