well ive only driven 2 n/a's my auto and my dads manual, both are japspec so elephant wont touch them, as i found when they decided to cancel my policy after 2 weeks, i tried adrian flux and sky insurance sky were slightly cheaper but they did mirror my no claims from my van(6 years) even then still £790 and im 28 been driving 8 years
if found the auto alot easier to manage since the gearbox does the work for you but foot the the floor lights to lights the manual is slightly quicker.
im not knocking the autobox by any means its the best auto i have driven and by a big margin (and i have driven quite a few)
the supra is a brilliant car but its not cheap £205 a year for tax, just replaced 4 tyres on 18's £688. full service+cambelt change £590.
guessing at 22 your gonna get a kicking with insurance.
im really not trying to put you off the supra its amazing but its gonna take a big bite out of your wallet