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On the average night I am rarely satisfied with my view at 300x but I guess it comes down to personal preference.
I would still go the 6mm-8mm TMB eyepiece. The eye relief is 20mm (so twice the eye relief on your 10mm) and the FOV is about 60 degrees. Keep in mind that a 2X barlow will effectively cut your FOV in half, so a 52 degree plossl will be cut to 26 degrees. The TMB will be a bit better than double the FOV so the object will stay in the eyepiece twice as long.
Also, the TMB is around $50 while a Saxon 2X barlow is around $70 I think. Added to that with the TMB you won't be looking through an extra layer of glass or fumbling around in the dark screwing barlows onto eyepieces.
Just my 2c.
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