the 1st gen RT/10s are cheapest and easiest to find . The 1st gen GTS coupes command decent money. Color matters as well . Yellow and Silver seems to be on the lower end where as red or blue tend to be the higher priced one

IMO a decent 1st gen GTS coupe will set you back upper 30s to upper 40s . depending on miles , color and condition . maybe even dip into the $50s if you stay newer model in good color and low miles
I saw what looked like nice cars in the upper 30s , But they tend to sell quick so be ready to jump if one pops up you like


I gave some serious thoughts to a Viper GTS coupe instead of old car. But the old car won out in the end