Man, I hear that loud and clear. I'm in a similar situation with work and free time and hence, dumped my project car for something else. My only comment is, what is keeping this next car from sitting for days/weeks/months while you make payments and then get jaded because you never drive it? I'm not throwing that out there to be crass, I am just curious because that seems to be the going rate for cars in that particular market.
What I didn't mention is I would be giving up my daily driver plush SUV for the GT500. Actually the wife would get the SUV. My commute is a whopping 4 miles. Some days I can start a song in my driveway and it hasn't finished while I'm parking the car at work. Also, if I really didn't want to do 8 miles a day with the GT500 then I'd buy a beater Volvo Turbo or get a beater diesel pickup (could be used for towing the car).
Since this was a Father & Son project it seems every weekend we ask ourselves, if we had a GT500 we could be at the track right now. We have Test & Tune every Wednesday and Friday nights here. If my son wanted to run a road course or Auto-X we have plenty of events around here currently. Right now we are watching this stuff on YouTube instead.