Hi Zoltan
An 8 inch dob is an excellent choice. If you have the money and space it is a better choice than a 6. Personally I would not buy the much smaller computer controlled scope. If you have a dark sky, the more aperture the better.
Each of those 8 inch scopes are essentially the same optically. The Bintel one has an extra eyepiece which is probably why it costs a little more. I think any of the three would be a good choice. I know you said the collapsible dob is not a feature you need but you may want to take your scope to a star party one day. The more compatible design would be handy there. If it were me that is the one I would choose.
Hope that helps
Rod
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