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Why didn't you get a ghost ring set-up where the rear sight is part of the rail? You might have fewer options now. I would talk to Casey over at Tac Ord. Great guy, excellent work.
I don't know about those fiber optic fronts. I saw an 870 fall over from leaning against a wall and the fiber optic front broke in half.
Not something I'd have on a gun I relied on for whatever .... I agree with drvrage about the ghost ring sights. Matter of fact, Casey has many of the Trijicon TrackLoc sets with tritium inserts front and back in stock. I just bought a set from him last week to install on a friend's gun. Price with delivery and taxes were exactly $170.15. These are the only sights I'd install on an 870.
You can still keep the rail on the gun, but it would be extra weight you probably don't want.