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Personally I wouldn't bother about getting an extra focuser on the back. Not sure what the distances are like with the CPC 1100 but with my Meade LX200 10" if I had a focuser on the back (I had a JMI) plus a diagonal, it diagonal would impact on the telescope base. For now I would say forget the external focuser and put that money towards what you're going to want to use now, the focuser is a better idea with photography moreso than visual.
For years I have been using a TeleVue 35mm Panoptic with my 10" F/10 (~2500mm) for general viewing. A 20-25mm plossl for galaxies and a TV 10mm Radian for planetary and globular clusters. The plossl I used was just a Meade one that came with the scope but it worked reasonably well.
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