whats my best line here on the turn??? and River?

[pokerraja]

Not exactly sure what is my best move here. Do I take the free card? or do I fire again? Also, whats best line on the river?

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (9 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Hero (t760)
CO (t700)
Button (t805)
SB (t1220)
BB (t535)
UTG (t690)
UTG+1 (t655)
MP1 (t540)
MP2 (t2095)

Preflop: Hero is MP3 with A/images/graemlins/diamond.gif, K/images/graemlins/diamond.gif.
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t45</font>, <font color="#666666">1 fold</font>, Button calls t45, SB calls t35, BB calls t30.

Flop: (t180) 4/images/graemlins/diamond.gif, 7/images/graemlins/club.gif, 3/images/graemlins/diamond.gif <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets t150</font>, Button folds, SB folds, BB calls t150.

Turn: (t480) T/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

River: (t480) A/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t80</font>, BB calls t80.

Final Pot: t640