I'm having Huper Optik applied this morning. I had this tint on another car and was very happy with it. From what I'm told, it has the best heat rejection performance of any tint.
Here's link to some specifications on the Huper Optik web site:
http://www.huperoptikusa.com/consumer_auto.cfm
The tint shop that I'm going to is offering $100 off this tint. That drops the price to $399 for the EX35.