To me the GTS\RT10 is the only U.S. car made in the 90's that is collectiable period.
Modern Vettes with their massive volume numbers are a JOKE. No way any Vette with 35K made per year will ever be worth any appreciation.
The Snake with it's style, limited numbers produced and that beautiful V10 will be a modern classic sooner than it took the 60's cars to appreciate. My guess is it will take the Gen I and II about 6 years to begin appreciating. Limited Snakes that are original like the GTS\R's, any ACR, ACR FE's, FE's, one and two year colors, 92's and 93's, all stripped GTS and RT's, Cognac's and all 2002 models will be the most sought after.