Value bet this riv with AA?

[Johnnyj580]

2nd hand in. No line on Small Blind.


Party Poker No-Limit Hold'em, $ BB (8 handed) converter

Button ($50.25)
SB ($48.25)
BB ($74.03)
UTG ($32.30)
UTG+1 ($48.50)
MP1 ($53.10)
Hero ($49)
CO ($12.15)

Preflop: Hero is MP2 with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.25.
UTG calls $0.50, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $3</font>, <font color="#666666">2 folds</font>, SB (poster) calls $2.75, <font color="#666666">1 fold</font>, UTG folds.

Flop: ($7) 3[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $4</font>, SB calls $4.

Turn: ($15) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $10</font>, SB calls $10.

River: ($35) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks.


What range of hands do you put the SB on?

He called out of position on both the flop and turn. Its fairly safe to assume he didn't call 6x the BB with a 5. Could he have a set and NOT reraise on the turn, as well as check the riv?

I put my opponent on 99-JJ with his flop and turn play. I fired a value bet of $15 on the river. What do think of this course? Would I have been better served longterm to check behind him with only a pair on this board?