I would start with a 15mm GSO Superview, then go for maybe a 10mm. I have two Explore Scientifics 82 degree 8.8 and 6.7 and while they are nice and wide field they are heavier than say Plossl. What are you going to be doing with the scope? If deep sky objects you want wide apparent and true field of view, but if for planetary then that's a different EP approach.
Remember you can buy a 2x Barlow and this changes your 15mm Superview into a 7.5 mm EP in terms of effective magnification. Your scope is a 1500mm focal length right? So a 15mm EP will give you 100x magnifcation, add a 2x Barlow ( make it a good one) and it becomes 200x magnification.
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