Ditto what Tony and the others have said about the ED80. You may buy the Megrez, but IMO the only extra you'll be getting is a fancy focusser. The additional money that you save with the ED80 will buy a decent diagonal (bintel have 2 inch quartz dielectric diagonals for $149) some EP's and mounting rings. If you're unsure, search the forum for images taken with the ED80, you won't be disappointed.
