A weird AJ vs. Maniac hand

[trevor]

Villain has been keeping an eye on me and vice versa. He has been isolating weak limpers, opening too many pots in position and basically playing good poker (pre-flop that is). Post flop he underbets the pot when he's missed and likes to bet the turn (for the min!) w/ A high a lot. He's semi-donkish post flop. I have re-raised him twice w/ pos, once w/ AK and the other on a re-steal. Both times he folded and the second time he typed in something to the effect of "next time I push you around, blah blah blah." We are running the show here.

PokerStars No-Limit Hold'em, $1.00 BB (9 handed) converter

UTG ($67.65)
UTG+1 ($42.85)
MP1 ($289.85)
MP2 ($28.45)
Hero ($129.10)
CO ($143.30)
Button ($77)
SB ($108.65)
BB ($38.70)

Preflop: Hero is MP3 with J[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
UTG calls $1, <font color="#666666">1 fold</font>, <font color="#CC3333">MP1 raises to $4</font>, <font color="#666666">1 fold</font>, Hero calls $4, CO calls $4, <font color="#666666">3 folds</font>, UTG calls $3.

Flop: ($17.50) 2[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
UTG checks, <font color="#CC3333">MP1 bets $3</font>, <font color="#CC3333">Hero raises to $20</font>, CO folds, UTG folds, MP1 calls $17.

Turn: ($57.50) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 checks, Hero?

Discuss.