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I'm just going to second what Rob and Rick have said; OAG is all about eradicating flexure. In my experience it's worth it even with small refractors.
Not sure what your dislike for OAG is, maybe you've just used some bad ones? There's a lot out there now and they can be fiddly.
I've used a few OAG now and believe it or not, the Celestron is great: helical focuser for the guide cam makes focusing a breeze, 360 degree rotation makes finding a guidestar easy, comes with heaps of adapters and spacers in the box. Get a decent guide cam and I don't know what's not to like.
I went from OAG, to guidescope and back to OAG and with a decent OAG I'd not consider going back to guidescopes.
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