I have a C&R Racing Radiator and it comes with a slim-line fan that blows probably more air than both my OEM fans put together.

Anyway, I bought this for $350 installed (fan included)

I was going to go with Fluidyne, but it doesn't come with fans, and those FAL fans are expensive. They are nice though. FAL carries a dual fan setup that is supposed to blow crazy air... but then again, after you're done buying the fluidyne and the dual FAL fans, you're set back probably about 5 large.