5.5: Donk, or good call?

[grayhawk]

** Poker Rewards[No Limit Hold 'em] Level 5 - Blinds are 160/320


- UTG (t2040)
- UTG+1 (t1910)
- UTG+2 (t1050)
- Button (t2120)
- SB (t930)
- Hero (t1470)

Villain posted the small blind - (t160)
Hero posted the big blind - (t320)

** Dealing cards to Hero: J [img]/images/graemlins/spade.gif[/img], T [img]/images/graemlins/heart.gif[/img]

UTG folded
UTG+1 folded
UTG+2 folded
Button folded
SB went all-in - (t930)
Hero called - (t770)

Reads - nothing special for villain, but his M is just over 2 starting the hand and the blinds double to 320/640 in 2 hands. With everyone folding to him, I think his range is huge, if not any 2 cards at this point. I am getting almost 2 to 1 on my money with a slightly better than average hand. My M is less than 4 before posting the blind in this hand, so I have to make a move of my own very soon and am about to put 160 in the next pot in the SB. I saw this as a clear call. Anyone care to convince me otherwise?