dude u say u r still 23? the best car for your level would be the cameno t2, or r u going to buy it with boost? the corvette and the bmw r still pretty far away, because of your level.
my ranking would be:
#1 Evora (42)
#2 BMW M3 GTR E46
#3 Corvette
the corvette got a nice topspeed but a poor acceleration and handling isnt as good as the topspeed either. a friend of mine got the BMW and we raced together with my evora and beat him on a highspeed track with few seconds. but u wont get those cars and u saved up 600k already, if u buy the cameno (t2 best igc car) u will still be able to buy the evora at 42