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A suggestion from a CG5 owner, if you want to image for longer than say 5 minutes then autoguiding is probably far more important than PEC on an entry level goto mount, unless you are prepared to sit there observing your tracking with a manual (say a $300) flip mirror guider and do alignment adjustments every 30 seconds - trying not to vibrate the scope as you go?
I think the cheaper $1,299 mount is actually better equiped for guided and therefore longer duration astro photography. You other option is to do plenty of short images and stich them all together using software to re-combine images that have drifted.
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