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The Sony ICX285AL is an ABG chip, no need to worry about blooms. If I'm not mistaken, its a 1.4mp array with a pixel size of 6.4micron. These are small pixels so you may want to validate you arcsec/pixel sampling. The chip can be binned so you can get the optimal sampling you require. Typically, many take luminance data as 1x1 binning (in other words, no binning) and the RGB as 2x2. The luminance contains the resolution. The RGB is simply there to colour the luminance as such the 2x2 bin doesn't compromise the resolution of the 1x1 bin luminance when layered. A 2x2 bin will boost sensitivity.
Narrowband filters aren't cheap. The smaller the window bandpass, the more expensive the filter is due to the tighter manufacturing tolerances. The Ha filter is a good item to have in an imaging arsenal, especially for those full moon nights. It makes imaging productive...collect Ha data when the moon is around, then complete the task new moon with LRGB data. You can also collect R filtered data providing the moon isn't too bright or in close proximity to the area being imaged.
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