I spent way too long fussing over what vehicle to convert. I was really only looking at European vehicles. I think they provide the best value as they depreciate quickly but still look the best inside and out.
Mainly looking at Audi’s and BMW’s on carsales.com.au and Gumtree. After selling my Landrover discovery 3 I finally bit the bullet and bought a BMW 1 series from a private seller in Victoria. It was a good option because it needed quite a bit of mechanical work on the engine (Vanos solenoids or something). Anyway the car cost $4500 and about $1000 to ship it to Perth. Most BMW 1 series were around the 8k mark.
After driving the car up and down the drive way a bit the engine started smoking which was quite amusing.