The ToUcam and NexImage are almost identical, so it's up to you which one you get. You will still need a capture program like k3ccdtools, and a processing program like registax.
Telescopes-astronomy is the best place to get the ToUcam + adapter. I'd ring rather than email, cause he gets very busy. If you get the NexImage, just get it from the cheapest place you find.
If you plan on using your dob, you'd better read my article,
Astrophotography with a dob, and be prepared for some frustration and steep learning curve. If you've got tracking, the frustration is much less but there's still a lot to learn about capturing and processing. My article deals with both and can be useful even if you do have tracking.
You will need a laptop, or drag your desktop outside. Unless you have perfect polar alignment and goto, with a motorised focuser that you can control remotely, and can leave your scope unattended, then you need to be next to your telescope and you need to be next to your computer.
Final note, these webcams (NexImage/ToUcam/LPI etc) will not work on DSO's, and do not brighten dim objects for you to view. They work only for planets and the moon and bright stars. You won't be able to use it for DSOs at all.
Hope that helps.
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