In my opinion, the car would have to have been priced at about 30% of the price here in France to compensate for the hassle of driving a RHD car here. The 407 diesel is a very good car, but should you come to sell it here it will be worth nothing. What resident would ever buy a RHD car, but as you say you intend to drive it till it falls apart that is fine, that only means that you have about 15 years of driving a RHD on the right side of the road. Don't get me wrong, I am not saying that you are doing the wrong thing, but I owned two LHD cars in the UK and hated them both after about 6 months, but there was nothing that I could do about it as they had no value on UK plates. I wish you the best of luck.