If you are looking for a bang for the buck option. I highly recommend the griffin universal 31x19. I am really pleased with mine. I have also heard that the Summit/Jegs aluminiums are also really good for the price. Of course there is the Fluidine and BeCool if you have the cash to spend.
Kevin
I have a Fluidyne and it's great. I had to replace one once though, my tranny line cooler fitting came unsealed and I had a tough time fixing it. So I just got another and sold it to someone who was going to block those off and use it on his 5-speed anyway
Other than that, no problems w/the actual radiator itself and it cools like a champ on my blown application.