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Shell, Bintel scopes are re-branded GSO telescopes - a chinese brand that a lot of people like, but I haven't had any experience with it personally except for a couple of accessories. So unfortunately I can't say whether their dobs are good, but what I think Brendan was emphasising was that if you want to do photography with a newtonian/dobsonian you will have focus issues when using an SLR camera - you can't get the draw tube of the focuser in far enough to achieve focus. With the skywatcher tubes (and this is where I have experience) you can make a very small adjustment to the primary mirror and that's it - you've got focus. No need to cut the tube down or change the focuser, so I assume based on what Brendan is suggesting, is that the Bintel/GSO brand might not be able to do this as easily, and you'd have to take more drastic measures to focus with your camera.
I've got an 8inch skywatcher newtonian and the other night I took it out when the moon wasn't creating too much extra light, roughly polar aligned my mount (and the neighbours lights shining down on me!) and took one 30 second shot of M17 and I was so shocked how it turned out (my first ever attempt, so still pretty bad), but I was very impressed with what such a cheap scope can achieve, and I haven't even begun to scratch the surface with all the settings, autoguiding, etc - everything is stock. So I'm sure with a 10 inch you'll be very happy.
Believe me, if you love photography, you're going to be wanting to do long exposure stuff eventually to capture DSOs. When you get to this point, your going to need a good equatorial mount that will allow for your scope plus everything else - camera, guidescope, autoguider etc. If you get a 12inch dob/newtonian, you'll need a mamoth mount in the future. I have an HEQ5 Pro and that I can only use my 8inch newt alone on it and that's pushing it.
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