The bottom line is which is more important to you : cost or originality? This subject has been thrashed so much that an entire herd of horses are dead. On the H.A.M.B. especially, it has become obvious that a well built aluminum radiator (welded joints and formed tanks) painted black is fully adequate for general use. Stay away from plastic tanks and crimped joints. You can get a good aluminum radiator for one quarter the cost of a copper brass/replacement.
I know nothing about you or your vehicle, and would not presume to have any idea of what would best fit your needs. I guess it's a choice of saving a bunch of money or impressing an ever shrinking group of focused people to whom this is important.
For a source, I would start by checking eBay. Interestingly, eBay has morphed from a place to make individual buys of hard to find parts to a mass marketer of many things. I am sure you will be surprised at the number of radiators available there in the $250-$300 range with free shipping.
I am mildly amused to see that out of 9 responses, I am the only one to actually answer the O/P's questions and not offer my own personal opinion.
