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Lots of good advice so far. For dipping your toe in a GSO 30mm Super view is not a bad choice due to it being so cheap. But, expect noticeable coma in those outer fields. The superviews were not designed to work well in a fast scope like a GSO 10" - ironically.
The question I ask you however is why you need 30mm eyepiece at all?
Your 26mm gives you ~45x magnification and 30mm gives 39x magnification.
I recommend getting the ES 24mm 82 degree's which will give you a magnification of 49x and a wide field of view of a true field of 1.5 degrees, scrap your 26mm and skip the 30mm. The ES 24mm 82 is priced well. Well made, well corrected for a fast Newtonian like your 10".
Also to consider the exit pupil is a at a good 5.1mm meaning you will still have bright views without brightening the sky back ground too much if there is any light pollution around.
Its also cheaper then the ES/Celestron/Televue 30/31mm and much much lighter.
Also to consider. There's only a small hand full of deep sky objects that wont fit in 1.5 degrees field of view. Put that into perspective of how large 1.5 degrees is. Last month I was looking at the Fornax cluster. I was able to fit 7 maybe even 8 galaxies into my ES 24mm 68 degrees and that only gives me a true field of view of just 1.1 degrees.
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