If you're replacing it I would get the Comfort Climate Windshield. If you're using shop like Safelite I would just be sure to get an experienced tech to do the job, and make sure it is good PPG glass, and if possible drive to them so they can do it in their shop, as opposed to mobile install.
If you don't know what the CC windscreen is, here is the answer, basically its a lightly tinted/polarized glass which cuts glare tremendously.
http://www.xoutpost.com/articles/x5/...tallation.html