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With your 'scope you probably got a 26mm (46x), 15mm (80x) & 9mm (133x) eyepiece. With a 2x Barlow you'll effectively get 13mm (92x), 7.5mm (160x) and 4.5mm (266x).
A 6mm would give you 200x which would just about be an ideal upper magnification limit. The 160x of the 15mm Barlowed would also be very useful. The 9mm barlowed would only be useful on nights of exceptional seeing.
There is a basic 12mm Plossl available to give you 100x & 200x when Barlowed and that is the lowest cost option and not a lot of extra cost.
Not sure how much you want to spend but a 12 or 13mm wide or ultra wide field (eg 12 or 13mm Nagler) would be an absolute stunner on deep sky (Omega Centauri) with your 'scope and when Barlowed would give you a wide 6mm with comfortable eye relief for extended viewing of planets.
The reason a standard 6mm Plossl is not recommended is that the eye lens is very small (peep hole) and the eye relief is very short, ie. eye right up close to the lens. Basically it is uncomfortable for extended viewing.
The coloured filters are for planets only and they to enhance contrast of certain colour features on planets. eg. Jupiter's red spot looks darker with a light blue filter (80A). Do not use the colour filters with your nebula filter or you will just lose light throughput. The nebular filter would be best with your 26mm eyepiece on things like M42 (sword of orion but wait until summer), M8 & M20 (Lagoon & Trifid, up high in the evening) and any other gaseous nebula. M17, the Swan nebula is very nice and up high in the evening.
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