I have had several Supra's, with many different wheel set ups, the best has to be the stock 17's, the ride was just superb, but that is not for everyone including me it has to be said
My current car had 19" Blitz Technospeeds and I found the ride too hard, the tramlining very bad and the wheel weight made the steering a little vague IMO
I have fitted WED SA70's with WED light weight wheel nuts and the car feels a lot better, the ride is smoother, the turning lighter and the tramlining much improved, the SA 70 is a much lighter wheel and which ever way you go get as close to stock off set as possible and as light a wheel as you can, good rubber is a must also