[Terry B]

Welcome SC
Don't do the Seben.
As for brands there are lots of choice. Look at what Andrews communication sells. They are good value and the right price.
As for motordrives for dobs. These are fairly expensive and usually only used for big dobs. Start with the non motorised. Maybe add an argo naevis as an object finder.
I think that this is a better starting option. For tracking most people would get an equatorial mount but this is much harder to learn with and is much more expensive.