Is it a final edition (RS2 style front bumper) or late edition (S2 style bumper)?
A real ball park figure without seeing pics etc and if its mint would be £2-£2.5 for a final edition and £1.5 to £2k for a late edition.
Go much higher and you are in cheapo A4 territory so expect a slow sale waiting for the right buyer....
Pics up though cos I do like cactus green cabbies ..

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"Earl" 1998 2.8 V6 Cabriolet
"The Duke" 1997 2.6 V6 Cabriolet (Sold....sadly)
Project "Best of Both Worlds" 1995 S2 Quattro Cabriolet