if you wanted to use the KT-436 and wanted a really good radiator you'd probably have to remove the hard drive bays or mount one on top. if you have the money then you should buy a bigger case like a full tower Lian Li if you have the money. but another good big case thats around 80 bucks is the LiteOn FS-020. you can buy it at newegg. its a pretty old case but if you wanted to paint it i bet you could make it look sweet. the good thing about it is that if you remove the hard drive bay below the 5 1/4 theres an extra hard drive bay up top so you should have all the space you need for drives. and the back has 2 120mm fan spots so you could also use that to store the radiator.
http://www.virtual-hideout.net/revie...20/index.shtml
a gallery
http://jpiperformance.com/gallery.htm
heres a site to find a heatcore that will fit your case
http://12.18.239.202/heatercores/default.asp
some heater cores
http://www.leakycar.com/heater_cores/index.html