Repair or replace leaky evaporator?

Thanks for the replies! I'd read somewhere that the OEM stuff was better quality than the new replacements and might be worth maintaining, and then there's the cost - looks like $250 and up on ebay. But it's hard to say how many leaks might be on the old original, or how long it would hold up, so I guess I'm leaning toward replacement. Does anyone have a recommendation on best price/product source?