I'd skip the barlow, the beauty of the newt is its simplicity the only glass you look through is the eyepiece. On my 8" (f6) newt I use the 25mm and 12.5mm the most, the 6mm on exceptional nights and I would add a 32mm (or even 40mm) for wide field views. As for the LPF I have one but have never really found it that usefull.
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