I may add a section about oil radiators to my write-up and one dedicated to AVCS.
By the time I finish writing, you'll see how the oil radiator is not really that expensive.
I did have doubts about reliabillity, but have been running my setup for more than 1.5 years now and I think I can advise for it.
I have not had any track day with my engine yet though.
Don't even think about putting a used oil radiator on your engine. I have a brand of new, cheap, OEM fitting radiator that works. A used radiator, just like a used cooler can bring debris into your engine's oil and kill it.
Hey, those Sti 6 pot brakes used to be incredibly expensive, I hope you got a good price.