Kings on A-high board give me headache

[Laetus]

I'm playing TAG and villain is playing 21/17/3.5. No history between us. What is our plan?

EverestPoker Game #2245315127: Table Nassau-0 - $3.00/$6.00 - No Limit Hold'em - 12:04:10 - 2007/10/21
Seat 1: morpheo ($672.10)
Seat 2: Mr.Blueice ($594.00)
Seat 3: FLiST ($618.00)
Seat 4: Vanootje ($679.00)
Seat 5: Catalaga ($436.80)
Seat 6: HERO ($1,342.60)
Catalaga posts the small blind of $3.00
HERO posts the big blind of $6.00
The button is in seat #4
*** HOLE CARDS ***
Dealt to HERO[K [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/heart.gif[/img]]
morpheo folds
Mr.Blueice folds
FLiST raises to $21.00
Vanootje folds
Catalaga folds
HERO raises to $72.00
FLiST calls $51.00
*** FLOP *** [3 [img]/images/graemlins/heart.gif[/img] J [img]/images/graemlins/diamond.gif[/img] A [img]/images/graemlins/diamond.gif[/img]]
HERO ?