As mentioned in a previous post. The Challenger would be a better bet than the Corvette.
I would sell the 2012 Challenger and take that money and move up to a newer one with the hemi; R/T, Scat Pak. Both you and your wife will love the performance of the Hemi over the v6.
Parts availability for the Challenger is endless, the Vette harder.
You and your wife will probably be asking yourselves why we didn't do this sooner. Just to add, if you went with the Vette, its hard to get good money for that era Vette when it's time to sell.
Good luck on your decision.