Thank you for your feedback, so many things to think about!
A few thoughts:
At this stage I will probably purchase my gear in one batch from the U.S, at the site,
http://www.highpointscientific.com. I would like to buy it from A.U, but the price difference is just too much. Also, from what I can tell, there is a 2 month waiting list even if I buy from A.U for some of this equipment, in other words, they appear to be doing what I am doing! Ground shipment is free.
I am starting to see that my Nikon DSLR may not be a good option mainly due to high noise, high operating temperature, information clipping and its shear size, it simply will be more finicky than a dedicated scope camera, so I may also buy a one of those. At this stage I am looking at the Atik 490Ex Mono, with a manual filter wheel etc which apparently works well with the Hyperstar.
I did not think of the f 2.0 focus difficulty, but I think I can overcome this with patience.The f2.0 also has some major advantages, such as much less exposure time. I think my biggest issue initially will be tracking.
I do like the idea of using the scope at high magnification for visual work.
I will look into the focuser, but will that be necessary if I get the Atik 490?
Regarding the mount size, I think I will certainly go for that, knowing from my own long exposure photography experience, the mount is a deal breaker and I do not wish to be buying a bigger one anytime soon. The mount can apparently handle the 14" model. The size is fine, I am not a small person by any means (6.3.5") and the weight is manageable for myself. I own a Caddy Van and can transport it in that.
At this stage I am looking at around 8k for the setup from the U.S. By nature, I like the technical side of things and computer processing, I realise it will take some time to get the hang of this setup. I know from past experience, if I get something easier and less powerful, I will within a year get this rig anyway.
Thanks again.