I would add that a CPO 85 would be my choice vs a CPO 60. Although CPO "deals" are scarce these days, they seem to release a few cars once of twice a quarter and there do seem to be a few deals in there. Heck, here is an S85 for
$51,200:
85 kWh Model S P25996 | Tesla Motors
VIN is in the 25,000s so it isn't a super new car by any means, and you get leather, dual chargers and the tech package for that price. I don't suspect it will last long.
I know people tout the quality of the newer cars, but it isn't like there is a magic cutoff where the quality suddenly skyrocketed. Indeed, many owners report the difference isn't as dramatic as some would lead you to believe and for things like rattles, those can generally be fixed (admittedly, you might have to be persistent with the service center). Like me CNasty, you are in Texas so we don't get the benefit of any extra state rebates as some others do (oh to live in Colorado with its massive stat rebate).
If you are going to go CPO, and considering a 60, I would only bite if one of those were dirt cheap. Otherwise hold out for an 85 - resle value alone should drive you there especially in Texas. We aren't exactly overrun with superchargers here (although Sulphur Springs opened yesterday - woot!).