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Star diagonal - get a 2" one - sooner or later you will one day want to put a 2" eyepiece behind it. Also the length of most refractor tubes are designed for use with a star diagonal, without one you may find the tube is too short and you can't focus the eyepiece.
Eyepieces - I have an orion 102ED, which is fairly short at f/7. I have basically three groups of eyepieces:
(a) a set of Vixen LVW's - big, heavy and you have to be careful to hang on to the tube when you take one out - otherwise the scope will flip down, the clutch on my mount is not stiff enough to hold it. Stunning to look through, though.
(b) A set of Edmund RKE's - small, cheap and lightweight 1.25" ones, compare favorably with orthos on my scope.
(c) few Vixen LV's - small and light 1.25" with excellent eye relief, mainly for having a quick look.
For practicality the small lightweight 1.25" ones are great as I don't have to worry about rebalancing the scope when swapping, and it will safely stay put when an eyepiece is pulled out. I use the heavy LVW's for "special occasions" when I am in the mood.
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