The only cell phone display I would recommend using is a little 128x128 color nokia display you can purchase for about $15. This display is very popular so sample code is plentiful for many microcontrollers.
Is 1.4 inches wide, so it maybe won't fit in the dmr, but would fit most halo weapons.
I agree though, working with these little screens do feel like a hack job because of that tiny ribbon cable.