Eyepiece issue



Just got a 10" Dob with 2" Crayford focuser.
My current eyepieces are 5mm, 7.5, 10, 25 and 40mm
in 1.25" size. Is there any reason to buy 2" eyepieces.
If so, what size would you buy first?
The scope has a 1200mm focal length at f4.7.

mike


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