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It really depends if you're looking to keep your car stock or if you don't mind if it's modified. If you don't care if it's modified, there are several good choices, but I'd go with Dewitts' radiator. It's a direct fit and works so much better than what you've got in there now.
I'll 3rd Dewitts, Fantastic quality, I ordered one on my 78 C3, service was fast and friendly, delievery was prompt (and I live in Australia).
The part fit like a glove, and was a night and day comparison to stock, when I find the C4 for me, and I get more cash, I will be giving them another call
Tom DeWitt is 'da man........He has a great reputation and his products are superior. Btw, he's easy to deal with over the phone and is willing to answer all your q's courteously. There is no such thing as a stupid question, and believe me, I've cornered the market on them......
Mike