Raise of fold preflop?

[APipeDream]

Stars $4/180, 38 left. I guess this is more of a "what would you do against unknowns here?". 3rd hand on this new table (note UTG+1's stack):

PokerStars Tournament, Big Blind is t300 with t25 antes (9 handed) Converter on pregopoker.com

UTG (t4845)
UTG+1 (t1135)
MP1 (t2630)
MP2 (t6710)
MP3 (t10877)
Hero (t10125)
Button (t4535)
SB (t20630)
BB (t6395)

Preflop: Hero is in CO with A[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/spade.gif[/img]
<font color="gray">UTG folds</font>, UTG+1 calls t300, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, MP3 calls t300, <font color="gray">Hero ???</font>