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Gareth, It really is a matter of where you see yourself going with EP's, be mindful that coloured filters are generally used for planetary viewing and that wider FOV's provided by 2" EP's might not be necessary for same. A 2" nebula specific filter would be a good option that would allow use across your EP range. A 2" ND filter for luna viewing for the same reasons.
Regards Greg.
P.S. coloured filters will highlight some planetary features but I would suggest that you try viewing with them before purchase, they might end up taking -up space in your gear box that could be filled with other stuff.
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