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Get the C11 but with and equatorial mount. Fork mounts are alt/az and are a bit too tricky to get into DSO imaging. You can use a wedge to mount them and convert them to polar but there is flexure from the tines of the fork. The equatorial mount will track well and that eliminates a whole range of problems from the start. GEM's are the most realiable mount.
The DSI is a CCD camera. You can connect it directly to the computer. However, you will need a guide scope to take long exposure images. You can initially get away without one, by using short exposure times under a minute and taking a whole heap of images and combining them, but long term you will be reaching for a guidescope.
The Nextimager that you linked is not the best for what you have in mind. It is only really good for the planets and even then it is not that great. Imaging equipment can be cheap to get you started but to get really super high quality images that you can print into posters requires more expensive camera's.
The same results can be achieved from CCD's as normal long exposure but like I said you will need a guidescope and dark skies. Many great results can be achieved, but choosing correctly now is important.
In terms of CCD's for DSO imaging, try looking for Sbig as a brand name. The are dedicated to DSO imaging. They are expensive but produce excellent results. A DSLR is the most appropriate at this stage though.
Paul
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