Check out Champion Radiator at championradiators.com. SKU 2375 is an aluminum 22" 3-row radiator for $210. I have one in my big block Dart and it cools just fine. It even looks exactly like the one on Mopar Charlie's picture.
Champion's price is the $210 as well for a 26". If you go with a 26", you should modify the radiator support so it doesn't block airflow through the bigger radiator.