Which electric fan?

I just got my shift kit in and now I'm looking to get an E-fan. What brands do you guys have and does it give you a noticable amount of power? I don't mind spending a little more and getting a bolt on kit, but if it is bolt on what all do you have to do as far as mounting a thermastat so it knows when to kick on?

Most of us use a ford Taurus fan, they are a good fit, affordable at the wreckers, and do a good job.

I basicly copied Rlith
look here
http://www.s10forum.com/forum/showthread.php?t=59490&highlight=hayden%2Fimperial