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Tim,
As someone else has previously suggested, the top priority should be a 90-degree diagonal. The 45-degree diagonal that comes with the scope will be difficult to use for objects high in the sky. Also, a higher-power eyepiece would be useful. A 5mm eyepiece would give 100X, which is probably the upper limit for your scope. Alternatively, a 2x Barlow would also give you 100X with your 10mm eyepiece. If you decide on the Barlow option, make sure it is one suitable to use with a diagonal (some are too long on the scope end). In regard to brands for diagonals, eyepieces and Barlows, Guang Sheng Optical (GSO) are reasonable quality and not too expensive. These are available from Andrews Communications and Bintel (sold there under Bintel brand).
Wouldn't worry about any filters, they won't do much for you with this scope. In regard to photography, you will be limited to the moon (which can be quite rewarding). For this you will need a T-adaptor to connect your camera to the focuser.
Good luck!
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