Hi Kirky,
From my experience with various types of refractors:
1. I would get a set of 3 moon filters, definitely!
2. A UHC filter (quite expensive) should be on your list. These can produce amazing results on nebulae.
3. A minus violet filter (expensive) but I'm not overly impressed with them they work but alter the colour balance too much.
4. Get a yellow filter - when you use it (or any other colour filter) you do not need a minus violet filter.
5. Use a green filter to take B&W pictures - your 'scope should produce very good results.
Thats my 2 bobs worth.
Regards,
Jerry.
