i was going by the comment '
After 10 years of visual and video astronomy it is time to progress to astro photography'
and assumed that he can already set up a mount and scope.
i think one key point being missed here is that you only have to learn how to use it once.
plus if you can achieve any kind of good result with a DSLR its only going to be better with a purpose built astro ccd 
biggest mistake you can make is to take it out on the first night and try to work it out in the dark as Allan mentioned.
you really need to have a play with it in daylight to get used to controlling the camera.
in the end its up to you, i just think its better to do something once and be done with it rather than fiddle around buying everything twice.