Yes, the cost of a Dob is not much more than the GST on a similarly sized SCT Goto scope. So you might as well just get one to try out.
Maybe you'll like it enough not to want an SCT and so can spend the rest of your budget on quality eyepieces and other goodies.
The 8" Dob is easily transportable (in the Corolla) with the OTA in its original box across the back seat and the base in the boot. I expect the 10" would be too in the same way, but you couldn't use the original box. The 12" will need a bit of interior "restyling" to squeeze in. I suppose you could also chuck the 12" OTA on roofracks.
Just don't be surprised if the ASIO boys come knocking to ask a few questions after you drive around with that bazooka on your car.
