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Dave, the Orion Deluxe 2" is a fantastic barlow but I don't think it would be suitable for the ED80. It's very long and heavy, so might get awkward in a 2" diagonal. It also might have trouble reaching focus with many eyepieces (you'd really need to try it to check).
I do know the GSO 2" barlow does work with a 2" diag in the ED80. Apparently there is nothing between the standard and ED GSO 2" barlows, so maybe save a few bucks and buy the standard (so-called "achromatic") if you're going GSO. If you want a nice compact and versatile 2" barlow, the Antares 1.6x is very good. I bought it from ScopeStuff. But unless you have specific reason for wanting a 2" barlow, a 1.25" might be better choice: lighter and more convenient with 1.25" EPs.
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