For the money you are talking about here (450 money) then you could easily get a 2000+ aristo and look at single turbo's and maybe have some cash for suspension MODs that are all the same as supra stuff. You want a big car you can throw around I chased elise's into corners and out faster at Castle donington in the do_luck. I utterly trashed a Porsche GT3 down the straight in it so much so he couldn't sling shot me in the bends.
Put it into perspective if you want the sort of power your supra has, with the handling characteristics your supra has, but you want 4 doors a boot and 5 useable seats then buy a sodding aristo.
PS you want to stick LPG on it that makes it cheaper to run and still have a boot you can fit 2 bodies in then buy a sodding aristo. I can't put it any stronger FFS. Everyone raves on about supra's around here and then wonders why the uneducated don't get it? Now see my world. The aristo has exactly the same running gear, same engine, same suspension setup, and is within 150kg weightwise on the supra. best part is vvti and in fact any upgrade came out first on the aristo.