I would like to chime in here as I have been doing a lot of reserach to get my jeep to run cooler here in PHX AZ.

So the stock clutch fan pushes somewhere around 2500CFM I think?
I wouldnt consider getting a three fan setup just yet. If you are already going to be replacing the clutch on your fan why not just convert to dual electric?
Saves the engine some whine and I know from research that if you can find fans which will push more than the stock setup did. Take a look at this here: http://www.angelfire.com/my/fan/electric.html

Also if you have not seen this website yet I would take a look at it. http://www.go.jeep-xj.info/ The guy is from Australia but he has a whole write up in there about different cooling upgrades. And besides in Australia RHD is standard right? At the very least take a look at that ford taurus fan upgrade.

I am way on yourside that I would rather buy good parts for that extra comfort in knowing A) its not stock B) its not going to have to be put on the list of things that could possibly have broken. $600 for a radiator is a lot however, so try some of these fan upgrades first? Full electric would be more quiet than that huge fan clutch IMHO. Not to mention that you can save some ponies by going full electric? Hey if you are going to be stopping and starting like a typical mail truck mise well save all the gas you can mate!

 

They also cover the taurus fan install here. Using Volve controller, Saab housing and Porsche temp sensor.

Currently gathering all parts myself. The temp sensor could be found cheap online.

 

Well I can tell you this I have had a Griffin radiator in my wrangler for the past 10 years and never had another over heating issue even in temps up to 120 degrees. I'm also running a flo cooler water pump . These are both excelent upgrades