I recommend against cheaping out on anything as critical as cooling and oiling components. The cheapest performance radiator I would recommend would be the Supra radiator made by Koyo. It's intended for the 1JZ, but only needs one extra drain plug and two pieces of aluminum stock to clamp the fan shroud in place. This rad can be had for under $300.
If you're looking for an OEM equivalent, there are a number of brands that make these for a very low price... including Koyo.
Personally, even if you want to keep the car bone stock, the radiator is one of those things where I recommend you upgrade anyway.
EDIT: BTW, that's a Koyo knock off.