I think your basing your reliability is in no offense, wildly outdated and inaccurate. The B series motor will take Moro power and last longer on bone stock internals and head gasket than a 2jz (2jz bottom end can handle tons of power but the rest of the engine needs a lot of work). The 6 speed or 8 speed auto will hold more torque than you’ll likely ever need. The electronics are reliable. Maintenance cost is honestly pretty damn affordable especially given the long intervals.

I’d almost be willing to bet the reliability and maintenance cost of the GRC and Supra to 100k miles is damn near equivalent.

The B and S engines are ****ing tanks. Hell, I’d say the B series engine is way more stout than the S series (s58 excluded) simply because of the crank hub (easy fix) in the s55.

If I wanted the best performance car with best reliability under $60k new, it would be the Supra. That engine and trans (both 6spd manual and auto) can handle such ridiculous levels of torque and with basic mods, you have a significant more reliable, faster, better handling and cheaper turnkey car than a MKV Supra.

The GRC is a completely different vehicle that I don’t think it’s a fair comparison and offer fun / enjoyment in different way.

Ultimately it’s your money and I can’t judge or tell you how to spend it, but I will say you might be selling yourself short by not driving a manual (or auto) Supra especially if you’re looking at boosting your NA Supra.