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You have an f/6 telescope. My opinion is that a 2 mm exit pupil is best for finding faint galaxies at a dark site - so you'd want a wide-angle (65 to 70degree) or ultra-wideangle (82 degree) 12 mm eyepiece.
But some people prefer a 3mm exit pupil eyepiece for general Deep Sky Object viewing, in which case you'd want an 18mm wide-angle or ultra-wide angle eyepiece.
For looking at planets at high power, you'd want 0.5 to 1mm exit pupils (depending on how steady the atmosphere is) which equates to a 3mm to 6mm eyepiece, delivering 400X to 200X respectively. Though 200X is pretty low for your telescope, which should easily be able to hold 300X at most places on many nights (i.e a 4mm eyepiece).
Regards,
Renato
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