The differences between the two model years aren't great enough for that alone to be a factor in your decision. It's the same basic car, same engine, and I don't think anyone will ever notice a driving difference between 16" wheels and 17" wheels unless they had a good imagination. People keep talking about retained value, well a 15-year-old car isn't an investment, they made over 330,000 C4s so it will never be a collector car. There are far more important things to consider, like the service history of the car, if it has all of its repair receipts then that is a sign the previous owner(s) took care of the car, which I think is a far more important factor than option codes or model year. Over the years I have replaced many things on this car: water pump, a/c, radiator, brake booster, master cylinder, headlight bushings, the front spring, u-joints, wheel bearings, power antenna, intake manifold gasket, fuel injectors, etc. These things cost a lot of $ if you do the repairs yourself, let alone having an independent shop do it, and you'll need to take out a second mortgage if you drive into the dealer service department for a quote. Bottom line is you will be spending money on this car to keep it on the road, this is why the repair history is so important. When people look at a Corvette, I always tell them to look under the car, it's one of the best indicators of how the car was cared for. Get it on a lift if you can. If the spoiler is broken, if the floor pan has been repaired, if the oil pan is all dented and banged up, etc. it's a sure sign that someone has been abusing the car. Also look for misaligned body panels, if the front bumper has been hit, it's really evident because it's difficult to get realigned again.