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Astropolak,
Just looked up the specs on your scope and it has a focal length of 2000mm and an aperture of 203mm.
Let's start with your aperture first. On a night of really great seeing and I mean really great seeing the maximum magnification your scope will support is about 400x. The rule of thumb used here is the aperture in millimeters multiplied by 2.
With your focal length a 9mm lense will give you 222x (2000/9) magnification which is within this range BUT if you considered a 10mm and get 200x (2000/10) this would probably be a more useful lense. Add a good 2x barlow and you have your theoritical limit with the 10mm, the 9mm barlowed would be over this limit.
From the Meade website that scope comes with a 26mm lense giving you 77x and, if barlowed 144x.
Add another about 17mm giving you 117x or 234x barlowed and you will be getting a good range of magnifications.
Just some thoughts.
Cheers
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