Contrary to popular opinion, transmissions break and headgaskets blow in.... ahem......asian cars too.
I say better to have an interesting car that is a percentage less reliable than a boring one that's supposedly more reliable. I've been through this with my SVT Focus, and I'll be right up front about it. This car has been unreliable as hell, in part to the design, but just as much to the maintenance practices of the stealership. However, it's a brilliant car and a blast to drive. I can't stand the other cars in it's class so I stick with it and it never fails to reward the driver.
I hate to be the one to suggest it but when this heating/head gasket issue occurred on my Focus it cost me an engine. It could happen in your case, obviously the worst case scenario. I stuck with mine and put an engine it. It's 30K later and I still have the car and have had some great experiences with it. Better these circumstances with the unique car I wanted in the beginning than likely lesser ones with some characterless asian clonemobile.