Both Modine and Nissens (the "preferred" brand on the BB) make all metal radiators for your car. RPR is a good source for the Nissens rads., sometimes they sell them on eBay at a reduced price.

There are those who feel that the metal radiators aren't necessarily more reliable or more durable than the OEM plastic/alumnium job. If you search the archives, you will find several posts about the metal radiators failing prematurely. The only real advantage that I can see to buying the metal rad. is that it is serviceable. The Nissens is also about 2x larger than the stock radiator and has 3-rows of cooling tubes, so if you spend a lot of time idling with the A/C on, towing, driving in the mountains, etc. the car will run much cooler.