AKo preflop against possible steal

[Rocco]

SB is LAG (a good LAG) and has been bullying the tables with raises now and then. He likes to punish cold-callers and I saw this as an attempt to sandwich MP2 and Button. I didn't put him on aces or kings, probably TT-QQ or AK-AQ, and wanted to see how he reacts to strength. Comments? Is this OK at NL $100? Don't play much ring games (only tournaments) and started off a new NL career at the $50-tables recently.

Oh... And I haven't done anything out of line at the table so far.

Party Poker No-Limit Hold'em, $0.5 BB (10 handed) FTR converter on zerodivide.cx

MP3 ($68.57)
CO ($62.37)
Button ($179.70)
<font color="red">SB ($169.89)</font>
BB ($84.61)
UTG ($94.66)
UTG+1 ($114.20)
<font color="red">Hero ($115.90)</font>
MP1 ($18.50)
<font color="red">MP2 ($34.70)</font>

Preflop: Hero is UTG+2 with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $0.50.
<font color="red">1 fold</font>, UTG+1 calls $1, <font color="red">Hero raises to $5</font>, 1 fold, MP2 calls $5, 2 folds, Button calls $5, <font color="red">SB (poster) raises to $24.5</font>, 1 fold, UTG+1 folds, Hero raises all-in for $110.5