I'd say the 35X is the way to go, no other consumer grade pump matches its performance, but the OP wants the 655. If it were me I'd spend the $180 on a Maelstrom res with the built in 35X and be done with it.
Also, Swiftech rads have a high fin per inch build, so they need faster fans.
“growing up, i always wanted to be a vet. til i learned there was more to being a vet than just putting down cats all day.” -digibucc