UrQ Radiator Replacement Options

[Andrew Finney <afinney@tamsconsultants.com>]

Here's the score so far on replacements for the main radiator in
my UrQ. 

Original radiator - $500 (ouch) 
One from a 1987 CGT with dual radiators- $220 (good, but still
need aux. radiator and no guarantee it will fit 100%) 
Sportwheels custom single - $800 (Excelent, still in beta
version, v. expensive) 
Go with single radiator from other 4000 series - ? (Some say
the late coupes had a larger capacity rad, others say the late
4000Q's had a larger capacity?) Chris Semple has a great deal
on custom versions of this. Didn't someone overheat with a
regular main w/ no aux?
Dialynx (Don't even ask how much, I didn't)

Anyone have any other thoughts or reasons why I shouldn't go
with the single rad. out of a 4000Q from Autobahn? Was there
really no reason that Audi put an aux. rad. in these cars? Plus,
why do the 130hp '87 CGT's have a dual system? So many
questions. Someone shed some light here before I'm stupid
and go with the cheap option combined with new low temp
thermostat and thermoswitch.

Thanks.

Andrew Finney
1983 UrQ.