What cup size will I end up with if I get 455cc high profile saline implants? (photo)

You will probably be a D cup.  I agree that you need a lift along with implants but I prefer the lollipop lift over the donut lift.  You will get better lift out of it and the avoid the problem of a stretched out areola we so often see with the donut lift.

Hard to know exactly but I find every 300cc usually goes up about a cup and half in size so you can use that as a kind of guide