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I have both the ES 6.7mm and the XF 8.5mm.
The ES 6.7mm will give you around 186x magnification, which sounds about perfect for planetary unless you have poor seeing. It also has a flatter field than the XF 8.5mm (as well as being wider) so will allow quite a bit more time between nudges.
If you're worried the magnification is too high then I'd seriously consider the ES 8.8mm you saw for around $135.
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