Same here. I just got a new set of 19" wheels and had the car aligned as well. I noticed the pull to the right so i took it back to the tire shop. They said it was the tires. So i bought new tires. Guess what, its still pulling to the right on the freeway.
Its like the car wants to be just a few degrees off center. I also noticed that every time i hit a bump it goes further to the right.
I am thinking about taking it to the dealer but i am sure they will want to perform an alignment and when that doesn't work they will just blame it on the wheels and call it a day.