the only car that i consider perfect for me is the toyota reiz.
While i was on holiday in china, i was often the passenger in my uncle's reiz.
BOY IS IT SMOOTH! A 2.5 V6 (the same one in the lexus IS250) mated to a 6 speed auto driven through the rear wheels.
It's a mid size vehicle, nothing to big but it does weigh quite a bit (around 1700kg), but all in all its the perfect car.
Now i believe that if Toyota imports the Reiz they might have a real winner here.