I think you can use a del sol half size dual core radiator, but you have to bend or cut out some of the front crossmember for it to fit right. I'm not sure though, I just think I read about it in a thread here somewhere.
I would just get a better water pump, high flow radiator, and high flow fan or fans(if two can fit), to handle the boost, but it really depends on how much boost you're running, but since you're going pretty high, I would look into those things.