Moving to 6-max, so prepare for a barrage of posts

Villain is 36/11/3 over 40 hands, no post-flop reads. I see merits in both calling and raising...

Full Tilt No-Limit Hold'em, $2 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($162.95)
BB ($230.05)
Hero ($219.45)
MP ($15.80)
Button ($213.60)

Preflop: Hero is UTG with J, J.
Hero raises to $7, 3 folds, BB calls $5.

Flop: ($15) K, 3, A (2 players)
BB bets $15, Hero...