$25NL 3bet pot... spew or good bluff?

[slush420]

Villain is 16/14/2.5 in a relatively small sample. Seems solid yet transparent. This is my 2nd 3bet pot in which he 3betted. Last time he c-betted OOP and I folded.

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($25.25)
SB ($24.75)
BB ($23.45)
UTG ($25.25)
MP ($28.70)

Preflop: Hero is Button with 6[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $1</font>, <font color="#CC3333">SB raises to $3.25</font>, <font color="#666666">1 fold</font>, Hero calls $2.25.

Flop: ($6.75) 2[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $4.25</font>, SB calls $4.25.

Turn: ($15.25) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $17.75 (All-In)