joey, welcome to the forums.
something from 1600-2500rpm due to the density of the fin package. the rating
of the stealth is 30 fins per inch. like the corsair H100 to get it to make monster
temp drops the fans need to have high static pressure and rpm.
you can for go the noise aspect with the high speed fans, but the temps will start
to creep warmer. i went from the GTX series and opting for AlphaCool, XSPC RX-
series or the HL SR-1. they have 12fpi or lower so low speed fans can be used
and temperatures will stay lower than the high fpi radiators.
start easy and cheap.. the corsair SP120 series in a dual pack seem to be great
performers and undervolt quite nicely. available anywhere.
airdeano