This has been said before but I'll say it again - buy the newest Vette you can afford.
With each year, improvements are made whether you can see them or not. Less squeaks and rattles for one. Ride improvements. Changes in the fuel management and OBDII computers (some don't think this is an improvememt!). In the C4, the later LT1/LT4's have the vented OptiSpark - a plus. If you can afford a 96 LT4, go that way. The LT4 is a real hot rod. The LT1 is a pretty solid motor also and can be upgraded in the power department easy enough.
I'm keeping my 92. It's my first Vette and has significant meaning for me and it's upgraded to LT4 plus power. And I have 2003 Vette in the garage next to it.