I have not bought one, but for my diesel project I was going to get an Aluminum one from Griffin Radiator, here is a listing for the AD truck one:
http://store.summitracing.com/partdetail.asp?autofilter=1&part=GRI%2D4%2D548AR%2DAAX&N=700+309431+115&autoview=sku

The aluminum radiators from Griffin have a very factory appearing tank shape, unlike all the other after market aluminum radiators I have seen. Griffin also has a reputation for providing first class products.

I need the inlet and outlet sizes to be slightly larger than stock, but same location, Griffin said no problem if I order from them directly.
I will more than likely have Griffin make my intercooler to fit the space available in front of the radiator. And possibly make the AC condenser too if I can't get a generic one to fit right.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-