The Modine radiator is fine for the every day driver, and they have a lifetime warranty. There are several other aftermarket radiators that are aluminum with plastic tanks.
The better question to ask yourself is "what am I going to use the car for, and what do I need in the way of a radiator for that purpose".
Are you drag racing, road course racing, endurance or hill climb type racing, or just general commuting and Sunday go-to-meeting type driving?
Next question is how much do you want to spend?
$200, $500, $1000?
You can get some beautiful custom made radiator for between $500 and a $1000.
Check out some of the car magazines that are "geared" to your style of driving and look for the ads about radiators, trans coolers, etc.
Check out your yellow pages for radiator shops.
Between the suggestion above you should be able to find the radiator to fit your needs. However, do not expect it to be cheap! rangerj