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It depends on how much clearance your diagonal will have with the base, but I would argue the 'refractor-style' diagonal (NOT the threaded-on SCT style) is the best 2" diagonal to use, and for several reasons:
1) It is threaded on the front for 2" filters. No need to change filters from one eyepiece to another when changing eyepieces.
2) It is very easy to turn it to the side when the scope points low by simply loosening the thumbscrew that holds the diagonal in. This enables your chair to have less seat height adjustment requirements.
3) It can be easily transferred to a refractor in case you have another scope. Hence, less expense for you.
4) the refractor style diagonals almost always have a larger clear aperture all the way through, so less vignetting of the edge of the field in low power eyepieces with large fields.
5) When removed, a 2" tube exists on the back of the scope, which allows accessories to be inserted, such as Lymax SCT cooler or even just an eyepiece when collimating the scope.
6) Barlows can be used in front of the diagonal for higher magnification if desired.
You have a scope that has correction to the edge of a large field. It behooves you to get an adapter to use the 2" diagonal you have. It will cost you less and have the advantages I mention.
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