[roughy (Mark)]

Hi. I've been an avid visual astronomer for many years and have decided to move into imaging.

I would like to purchase a reasonable quality camera that will suit most purposes for a long time to come. For example, I think the Atik 383 or SBIG 8300 (both around 8mp) seem to fit this bill. Their price range is also my preferred option. However my knowledge of this topic is extremely limited. Some help please.

Why do monochrome and filters seem to be preferred to one shot colour?
Is it better to consider the relationship between pixel size and array size rather than getting the biggest array?
Are there just as good 2 and 4 megapixel options even though some of these appear to be a bit more expensive?

I am about to set up an RC8" and will also be getting a 100 to 110mm refractor in the medium to long term.

Any advice would be greatly appreciated. Many thanks.

Mark