The car brands I would most like to test drive are Maybach, Lambo, Bugatti and Ferrari.

Some of the brands I have not driven, and I am not going to remember them all and therefore I'll list the ones I do remember:

All the real expensive ones: Lambo, Ferrari, Maybach, Bentley, RR, Pagani, Aston Martin, Maserati, Bugatti

Of the mainstream cars these come to mind:

Lexus
Infiniti
Acura
Seat
Skoda
Kia
Hyundai
Fiat
Citroen
Daihatsu
Proton
Perodua
Tata

And of the older great ones that would be nice to have back and try them out:

Packard
Studebaker
Duesenberg

Another couple of "smooth rides" that I remember as Taxis long ago:

Volga
Pobeda

And not such smooth rides, but would be nice to see them again:

IFA
Moskvitch

Edit: Forgot a couple of important brands that I'd like to see back: Horch, Wanderer, and maybe also DKW (even though in more recent history DKW just changed it's name to Audi in the 60s ) to live alongside with Audi