You could always get a quote from these guys. I've had them build some radiators before and they do excellent work. There's a template you can use which makes it pretty easy. I believe I spent $400 on the last one I had made (for a 60's Thunderbird).
Griffin Radiators™
Living in SoCal you should be able to find a good radiator shop to inspect your radiator and make sure it's bad or crudded up before throwing money at the problem. I used to go to a place in Reseda that did great work but the name escapes me.
You should also check things like making sure you have some sort of fan shroud to duct air through the radiator. Not running a fan shroud will cause overheating in traffic.
If you go the international route, I would check their electric fan prices against somebody like summitracing.com. They're just your typical aftermarket electric fans and many places stock them.