thanks everyone for your replies - I appreciate it.
still a bit undecided on where to spend the money
i think I want a larger sized osc cmos and a planetary cam
which i could do with a qhy183c or 163c or 2600mc but I would just lose out on some fps not that they are slouches and more than capable of producing excellent planetary images just that something like a zwo224mc can do about 2-3x as many fps and probably result in some better images in average seeing.
thanks