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You can use a 42mm superwide (which is the widest you can go in 2" format) but don't spend much on it. You just need to be aware that it will not let you use the full aperture of the scope. It will be like having a 9 to 10" scope with a large central obstruction instead of a 12", but the EP should still be useful for finding things and taking in the widest fov possible. One benefit of the exit pupil cutoff at your eye is that the effective f-ratio of the scope will be increased, which means that you can get away with a less well corrected EP. A 42mm Superview should be okay.
The widest TFOV "serious" EP, ie one that uses the full aperture of your scope, should have an FL not much greater than 30mm (maybe less, depending on your eyes, age, skies ...). How much $ do you have to spend?
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