The Tamiya 16th scale RC tanks will be about two grand for three tanks and you will have to assemble each one, about 12 hours contruction time each.

The Tamiya 25th scale RC tanks will be about 400 dollars, less construction time.

The Wasan, Ripmax, Kyosho, Hen Long etc. 16th scale will be about 400 dollars for three tanks and are RTR.

The Mauri, Academy, Hen Long etc 24th scale will be about 300 dollars for three tanks and are RTR.

If you are into high grade performance and realism, the Mark-1-tank, Armortek, 6th scale tanks at about five grand per tank some assembly required.