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Confirm your budget for the entire set-up (mount normally costs the most out of all your gear).
Confirm your target set - what sort of Objects you will most likely wish to image (to confirm this is compatible with the selected OTA - e.g. very faint nebulae in bright skies - more likely requires a large Newtonian or SCT or RC and/or narrow-band filters might make more sense)...
What size CCD will you seek to use? - if its a full format one, to avoid coma and provide a flat field certain apo designs may work better than others.
As Mike said (and he would know) more information from you means alot better advice will be given!
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