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As Kal metions the 50X per inch rule is a theoretical limit only, it rarely applies in practice because it does not take account of the prevailing seeing conditions . Some scopes because of poor optics will never get to this, others because of excellent optics will easily exceed it, in good seeing. Always remember that a large scope is more severely affected by seeing conditions and thermal stabilisation issues than a small scope. A 6" scope is small/medium but a Maksutov can take a long time to temperature stabilise because of the thick meniscus corrector lens combined with the closed tube design.
I think an eyepiece of either 7mm or 8mm would be ideal for your needs. This will give you 257X and 225 respectively which are good powers for lunar/planetary observation. You would find that because of local poor seeing, you would get a lot more use out of an 8mm eyepiece than you would out of a 7mm. I would consider the 8mm Stratus/Hyperion for 225X or the 8.5mm Pentax XF for 210X.
CS-John B
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