^^^ what spankmeyer said. its not the finish on the screen that determines what the images do at extreme angles, but the type of technology used in the screen.
the glossy finish does help with sharper images, and richer colors, but, it is highly reflective. so, if you are sitting outside on a sunny day, you won't have a huge glare on your screen...you will have a crisp, bright reflection of the scenery behind you. in either case, rendering the laptop almost unusable outside.
that said, if i was going to be working outside, or in an area with bright lighting, i personally would go with the matte finish, as i find it to be less intrusive than the glossy finish.
i'd say, try to find one of each type and test them out, to see which you prefer, but given your time frame, that might not be an option.