You have the money to pay off the Mini and live debt free while deployed? Do it.
Like was said above, pick up some quirky euro car that you can't get here, if I was going to the Netherlands and could ship a car back I would absolutely no doubt in my mind pick up an old Alfa or Lancia that's hard to get here, you'll be practically tripping over them and when it's all said and done be out less than the price of a Toyobaru even if you like it and want to take it home.
Edit: Plenty of Toyobaru's when you get home and they'll be even cheaper on the used market.
Edit 2: Some cars in the Netherlands are half the price of their American counterparts