This is only my opinion but..
The meade lx90 series is the entry range meade. When you compare the lx90 to a lx200 or lx200r there is no comparison regards the strength and stability of the mount/fork arms and the tracking ability.
I think the CPC 800 is more like the LX200 series in this respect. It's just a solidly built scope and so with a wedge would probably be better for astrophotography than the lx90. As far as optics are concerned a good meade is probably as good as a good celestron.
I have a Nexstar 11, but i dont image through it, i use a small refractor instead. Tracking and goto on the Nexstar is fine.
Paul
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