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Paul Mayo uses a 12" GSO ontop of an EQ mount for (amazing) deep-space astrophotography. There's absolutely no reason the same setup couldn't be used for planetary imaging.
The GSO optics are great for the price. I haven't seen and can't comment personally on how they compare to premium optics, but I guess it will come down to what you're prepared to pay for maybe an extra 2-5% better image.
I can only go by the images that DP and I get with out 10" GSO's.
You also have to weigh up whether a bigger scope is going to deliver a better image than a better camera would..
In my opinion, I'd be looking at getting a better camera before upgrading to a bigger scope. The 925 is more than adequate to get spectacular images. You just need a better camera.
If you've got $2k-$3k to spend, i'd look at getting a monochrome camera with motorised filter wheel and RGB filters, and use that with your 925. The Pt Grey Research cameras are better than the DMK's, and the Lumenera 075 is also better than the DMK. It just depends how much you want to spend.
But to answer your original question, a 12" GSO newt on an EQ mount would work great. My next scope will probably be a 14 or 16" newt driven by servocat for imaging.
Also remember though, the bigger the mirror, the more issues with cooldown etc.
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