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10" is good for visual appeture but then better on a dob mount. If you are a DIY person then you could build this easily. But for imaging you need a good mount, spend more on your mount and you will be better of in the long run.
For imaging DSO with 400D, I would say a 80mm retractor is the better starting point and your current mount should handle that ok.
Alternatively you could go for a EQ6 mount and keep you 10". See Eric Ezystyles images posted with this setup using a DSLR. This setup would also double nicely for Planet imaging but you will need to get a 3-5x barlow to increase your image scale. This is possibly the optimum solution given what you have at present.
For Planetary the a C8 on a Fork mount or EQ mount would do, as long as the mount can track well. DSO work at this focal length will require a substantially better equatorial mount a EQ6 could be tuned to do it. If you are getting a used one, the C8 late 90's models with starbright are just right for this.
I think best for you maybe a the EQ6 mount, keep the 10" and add a 80mm ED Refractor. Throw in a Toucam and a barlow and your all set. If you can afford it or can save and wait get a G-11 will last you longer and can handle a wider range of OTA's. Also a Fork mount will limit your OTA choice to one. Now that I have the G-11 I find i am free to chop an change my OTA as needed to suit my current imaging needs. Like i said before a good mount is the key to long term success.
Regards
Fahim
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