The alignment shop should have taken care of centering your steering wheel when they did the alignment.
The play in the steering should be able to be adjusted out. There is a set screw on the top of your steering box that adjusts the backlash on the gears in your box. It's an easy process & there should be a thread or 2 on the process.
Edit:
Here's one: http://www.vehicross.info/forums/sho...=steering+play