Update:
I got the 3M Color Stable tint today. I initially wanted 5% back and 35% front, but the shop I went to only carried the 35% and the 20% to my chagrin. In retrospect, however, I'm glad that I opted for the 20% back, I think any darker would have compromised my ability to see out my rear window.
I paid $180 flat for the entire job. I think that it was a pretty good deal given the quality of the film and the reputation of the shop. If anyone else is interested in having the 3M Color Stable for $180, check out
www.tintmastercity.com, and ask for Robert. He's a pretty nice guy. I'll try to get some pics up soon.