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Hello, Mystical.
Many might say that a 10" Dobsonian mount is readily portable and, to an extent, it is. I cart mine outside when I get the chance without too many problems (dodging door jambs and the like). I do it in two stages though, as it's very cumbersome. From memory the tube and the mount both weigh around the 20Kg mark. The tube, due to its length, is awkward to manoeuvre in smallish places. At this point in time I have not attempted to load it into the back of my car but I suspect that it's going to be difficult until such time as I work out some sort of a system. The base (the Dob. mount) is bulky but more easily carried courtesy of a handle.
You will need to work out a way to secure the tube once it is in the car as you don't want that sort of mass ricocheting around the cabin should you come to a sudden halt. The seat belts could well work, but I'll leave that to others to comment upon. In my case (I have a hatchback) the base should fit readily into the rear luggage area.
I cannot comment on the ETX70 versus the 10" Newtonian except to say that you will be gathering a significantly greater amount of light with the larger unit. I have used my 'scope to view the planets and, while one is spared the scourge of chromatic aberration, I doubt that I see as clear an image as would someone with a decent quality refractor.
Eyepieces: You will probably find that the retailer from which you purchase a 'Dob' will also include eyepieces in the package. In my case it was 9mm, 15mm and 26mm. These are a pretty good starting point for someone like myself who hasn't used a 'light bucket' before. Keep in mind that the current GSO 10" Newts are around the f:5 mark. This means that collimation and regular checking of same is important. Should you buy such a beast then make sure you also purchase a collimating tool (I have found the Cheshire style of unit the best for my purposes). You will find plenty of information on this site on the subject.
Whatever you decide, Mystikal, I wish you well.
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