Or just get a decent air cooler which will perform just as well as that closed loop water cooler (if not better) and be quieter.
http://www.overclockers.co.uk/showproduct.php?prodid=HS-020-AL
Also, reckon the GTX670 is well worth the extra over the 660Ti. As Katsumoto says, drop to 8Gb of ram as you won't need any more and spend the money saved on the 670.
Another point, will that fit in the BitFenix Prodigy?