I would roll with the 2x 120 for Sandy, My h70 does a decent job and provide stability at 4.5 24/7 for my gamer in a warm inviroment.
use the 3x120 for the vid card or cards depending on what your doing.
My experience with the 655 and all the rinky dink water cooling site pumps is that they all blow .....
Ehiem FTW .... more work involved though
http://www.buy.com/prod/eheim-univer...211941442.html
It will pwn ............ just make sure you have your clamps tight ............
