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Lewis,
Where do you intend to be imaging from ?
. . . what is the light pollution like, what is the seeing like ?
The questions really are - what image scale is going to suit the galaxies you are interested in ? and therefore what are the seeing conditions you expect to be able to image in and
what sort of maximum exposure time is your light pollution going to allow you to capture with your given camera (well depth and noise) and will that be sufficient to capture the galaxies that you are interested in
Obviously imaging from within a light polluted capital city with the low well depth (and moderately noisy) chip like the KAF8300 in seeing that is rarely better than 1.7 arc secs is going to be limiting for getting any good detail in faint distant galaxies.
An ideal galaxy imaging setup is likely to have an image scale around 0.5 arc secs per pixel, probably have a CCD well depth of 50,000 to 150,000 e and low noise in a dark sky which supports seeing conditions that roughly matches your image scale - or an awful lot of images and lots of deconvolution !
Try using CCD calc as an intial test to see how the frame captures the galaxies you are interested in.
My guess is that the large galaxies will be OK with your rig but the small ones will be mostly unobtainable at any sort of quality.
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