Help with Wheel and tire combo please!

I've been doing some research and comparing tire sizes here lately so that I can get my wheels and tires ordered before too long.

I've been thinking about going with 225/60-18 on the front and 255/60-18 for the rear, the tires are 28.63" and 29.04" tall. Do you guys think the tires are too tall? Should I look at a shorter profile?