I have used Thermochill nearly the entire time i been serious about watercooling, so big recommendation to them.
XSPC RX series are good, same as Feser - you will get a difference with rads, "thick" and "thin" rads
Thick rads will generally have a wider fin pitch, so work just as good with slow speed fans as high speed fans - you don't need a high static pressure to force air through. Thermochill are like this and i run my fans on my 120.4 at 800-900rpm even when stress testing 4.4ghz - i barely lose 1c in temps if i push them to the full speed
Thin rads work better with high static pressure fans, usually higher much noiser but cheaper rads.
In general fat rads > thin rads
EDIT: Damn you Shadow! took me a month of sundays to click post...