top set on the turn... checkraise or fire?

[PokerGoblin]

Party Poker Pot-Limit Hold'em, $2 BB (6 max, 5 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

BB ($147.53)
UTG ($198.80)
Hero ($360.50)
Button ($183.12)
SB ($306.45)

Preflop: Hero is MP with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img]. SB posts a blind of $1.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $7</font>, Button calls $7, <font color="#666666">2 folds</font>.

Flop: ($17) 5[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $16.15</font>, Button calls $16.15.

Turn: ($49.30) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero?

No real reads on my opponent, he had just sat in a few hands before. I suspect he will bet if I check, and may fold if I bet out.

Thanks

PG