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If your car is a 1SB then any factory Nav is a PnP install BUT you can't use the bluetooth. The BT is integrated as part of the OnStar module and AFAIK there is no way to retrofit all that stuff.
IMO your best bet is an aftermarket HU with the goodies you want. Best source around here is C5 Bearsfan if you're interested. Here's one of his posts with contact info. Good luck.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.