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If astrophotography is your intended purpose then I would have to say you should reconsider all of those scopes as none of them are good platforms for starting out in astrophotography. Im not saying you can't use them bit the learning curve for DSO imaging with large apperture and long focal lengh scopes is long and frustrating....
Also the LX90 does not have all the autoguiding/pec options and microfocuser that the LX200 line does which is a major factor for astrophotography.
If you are new to astrophotography then I do not suggest an SCT to start out. Unless you buy a widefield scope to piggyback on top and use that as your learning platform. There is a saxon ED80 going for 450 in the for sale forum that would make the perfect learning scope for astrophotography mounted on top of either the Celestron 11" CPC or the Meade 10" LX200GPS. Once you have mastered this then you can stick the camera into the back of your SCT. I have an article in the next Sky and Space and the topic should explain clearly the reasoning behind this advice... It comes from experience as I did extactly what you are about to do....
FYI You should be able to pick up a VERY good deal on a 2nd hand meade lX200 as many are upgrading to the RCX400's
Best Regards
Chris Venter
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