I used to have a Lexus, very nice cars.
Why not go a Lexus GS300? Same N/A 2JZ engine as the Supra but you get 4 doors, 5 comfy seats, leather and a sunroof.
My take on it is if I was going to get a non-turbo car it would be a nice cruiser, if I was going to go a "sports" car, then I'd go with a turbo model. In saying that both the R34 and the Supra in my opinion are very good looking cars, so if you like the look, why not buy the car?