Best wheel and tire size without upsetting balance
 

I've began looking at different wheels and I have a few questions.

I plan on going with a turbo next year. I do not want to upset the balance of the BRZ when it comes to it's precise cornering which makes this car what it is, so much fun to drive.

I don't know much about anything but I am assuming I will need better (stickier) tires and I want to have a set of summer wheels to put them on when I go turbo.

What would be the optimal size of the wheel, weight, and tire size to maintain the balance and handling of the BRZ with a turbo? I'm thinking I don't want more than 300whp.