Pontiac with a revival of their classics, a true modern take on something like a firebird, GTO, tempest, etc. Oldsmobile too with a revival of their classics such as the 442, hurst/olds, and cutlass, just to name a few.

Depends if the car is carbureted or fuel injected. If it’s carbureted, then yes let it warm up and get up to operating temperature and adjust the choke as needed, if it’s fuel injected, you can drive off as soon as you start it, as long as the windscreen isn’t iced over then it might be smart to let it defrost for a few mins but even then 10 mins sounds excessive

Ineos grenadier

My favorite car not available in North America? Probably a two door series 1 Range Rover. Cheap in home market, super rare in NA would be a three door Land Rover discovery.