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I would get a 32mm Plossl to maximise true field in 1.25” size but also to give brighter images at the low power. A 40mm is also an option for more exit pupil at the expense of apparent field but true field is same as 32mm.
If getting a 2x Barlow then forget the 6.5mm eyepiece as a 15mm with Barlow will give 167x which is very nice for Jupiter and Saturn and can reveal lots of detail. A 10mm and Barlow will push your ‘scope to its limits but be good for Mars (and other planets) given good seeing. A 10mm alone is good for Jupiter and Saturn when seeing is good but not great.
Filters are for serious planetary observers that use the different colours to tease out different coloured features. If you want a single filter get a light blue 80A or Orange 21 (or both) or none. The blue helps with contrast on the Great Red Spot on Jupiter. The Orange is a good for Mars but Mars is quite nice without any filters. Most observers say that all filters do is make the planet appear the colour of the filter and that it then doesn’t look that good. True but that’s not the point of the filter. It is simply a tool to enhance contrast of a particular surface feature and the filter selected depends on the surface feature colour being sought after. I wouldn’t get any coloured filters yet until you know if you enjoy observing planets.
I never use neutral density or polarizing filters especially the latter. I find resolution is compromised with polarizers and if all I want to do is dim the light I simply increase the magnification. Best way to enjoy the moon is with a binoviewer and an SCT is very binoviewer friendly. Consider it an option after a year or so as it adds another dimension to lunar observing.
A UHC or O-III filter is good for nebulae and best at low power for the larger objects. O-III is good for the smaller planetary nebulae too. An active dew controller (heater) is not critical but a dew shield is recommended to also eliminate stray light.
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