Supra TT's are pretty nice if they are nice and clean... but most of them have horrible kits, yellow headlights, really bad rims.... I looked on carsales the other day just out of interest and they only ones i likes were VERY expensive... but they were very late model and low k's so I guess thats fair enough. But one of them left stock will be very reliable, the 2JZ is one of the most over engineered engines ever built.
However, if you are leaving stock the GTR would be very good also and stock for stock would be more fun to drive i think you will find. I would just keep your options open. Just focus on a clean example weather it be GTR or Supra...