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Hi Simon
Welcome to IceInSpace!
In my experience, filters for visual observing usually sit in your eyepiece case and very very rarely get used. The only filters I'd (personally) recommend are nebula filters such as OIII and UHC, which can increase the contrast of certain nebulas for your deep-space object viewing.
Moon filters are ok in that they cut the glare from the moon, but with 127mm of aperture it's not likely to blast your eyeballs out - not like the view of the moon through my friend Rod's 20" telescope. Increasing magnification is a great way to cut the glare from the moon. Try a shorter focal length eyepiece or stick a barlow in there.
Skyglow filters - I haven't tried any myself so I can't comment. They're supposed to block the wavelengths emitted by sodium street lights. Others who have tried/own them might be able to comment further. In my experience though, there's no substitute to getting out of the city lights and observing at a dark sky location. You should try and get up to Cambroon with the other SEQLD based folk? They have regular observing nights up there and you'll get to look through some great (big) telescopes, as well as make some nice new friends. It's always much more fun when you can share your hobby with someone.
Coloured filters - I don't use them. I own them, but just don't see any need to use them. Certain coloured filters are supposed to highlight certain features on certain objects, by increasing contrast or blocking wavelengths from to reveal structures that may be washed out in the normal white light view. They're reasonably inexpensive so not really a huge investment if you want to try them out for yourself.
Hope that helps.
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