Yeah best bet is PWR or Natrad, Pwr is the better choice from memory it will sting you bout $400ish.
If you plan on making it yourself make up some cover plate to protect the fins when welding and some blanks to test the rad, I normally pressurize them to about 20 psi then submerge them in water to find any pin holes, just make sure that before you go to weld it up to clean all the flux and solder off of the joints your about to weld.
Try useing scotch brite rolocs ( the brown ones) there not too aggresive and will give you a nice clean joint then wipe it down with acetone and it should come out a treat if you need anymore help drop me a pm I can't tell you how many different rad's I've made too many to mention.
Oh and if your makeing a res tank for it get some spun end caps for the top and bottom you can get alot of different shapes just pick the one you like most and a bit of ali tube and the jobs done! good luck mate
Oh yeah another trick bit is to put your oil cooler into one of the side tanks it look the biz and works a treat too hope that helps.
Almost forgot buy some spun donuts too for your exit pipe its a much tighter rad than any elbow you can get and then you can have it come of in any angle you like and have a few more peice's left over if you want to make up some hard lines to return to the engine.