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You won't need a diagonal with a reflector so you'll have to sell it at a mark down price.
But, using a refractor (or an SCT) without a diagonal for observing must be a real struggle (like me trying to use my straight-through finderscope at higher elevations - Ouch!).
Now correct image for star-gazing? I don't think so since you'll get used to the movement of the image versus movement of the scope and you can certainly flip/invert Stellarium (to name one planetarium program) views to suit your observed image.
It seems to my reading that the mirror diagonals are preferred. One mirror surface versus several surfaces/interfaces and glass transit in a prism should mean less light loss and no CA and other nasty things that light does when it transits glass.
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