Yeah, insurance will depend on if I have to finance any of the new car since full coverage is required by the lending institution. It would be more than I am currently paying for liability insurance on the Miata. And I really don't know much about consumables as related to the Corvette, so I'll accept your expertise. Still, I think I'd much rather pay for a set of tires for the Miata than a Vette. (Taxes would be substantially more as well)
At this point in time I'm still going with Plan A. I still have plenty of time to change my mind tho...