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Interesting question. Remember the scope is only the lens part of the imaging rig. So no matter how good you camera is or what filter you use, if the scope/lens is sub standard, then there isn't a lot the camer can do.
So getting an achro over a APO is really not the point, the point is getting a scope/lens that can gather sufficient light AND project the image to the camera. Therefore a large achro will be good at gathering light, but still suffering from coma, while the smaller APO will have a good image but not sufficient light.
One variable is the mount or the exposure time. So a solid and accurate mount will allow smaller scopes gather more light, therefore producing superior images.
Bottom line, if budget is tight, get a decent APO and a solid and accurate mount. Aperature rule has its limitations when it comes to imaging.
My 5 cents worth.
Bo
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