The Envy only looks like a MBP. It's much thicker and doesn't feel anywhere as well made.
If you do a lot of photo editing, you should get the matte screen for sure. I have the 17" MBP unibody, and the matte screen really helps if I am working in a cafe, or I have to show clients some of my work at a cafe. You can live with the glossy screen if you work at home in a dark room too, but reflections from your windows or even closed venetian blinds can be a pain in the ass.
http://www.robgalbraith.com/bins/mul...=7-10041-10146