If you want to do it for cheap, I have a suggestion.
1987 Audi 5000CS
I think it was the same up through 91
I bought mine at a junk yard. $50
No rust, perfect condition (minnesota is a rusty state, if anything can make it 20 years with no corrosion, thats simply amazing)
The radiator fits PERFECTLY where the AC condenser used to be
Room for intercooler pipes on both sides of the radiator with MINOR trimming of plastic tabs
This baby is thick! 2 full inches! (replacement radiators are like 3/4 thick)
Having been disappointed in replacement OE radiators, let me attest to this one's quality!
There is minor fabrication required to make mounting brackets and lengthing radiator hoses, but its totally worth it! (you also need a DSM water neck w/cap)