So my feel is that you will not lose money.
I think you are safe on your numbers and possibly a little high if it is well maintained already. If it has had the usual glitches done already then you should be good.
Series 1 was most produced and had a few more burps to cure as well as being a bit older now. Series 2 was rare and had a couple of the niggles reduced (gearbox/brakes, roof and trim improvements)
1 & 2 probably have a little paint bubbles now as they are getting on (12-16 years old)
Series 3 and 4 were both low volume and had further improvements so should be better from a "set right" cost point of view
Age and milage is not really the point, service and some regular usage is.
Worst case is you buy one and then after a couple of years go back to a more sensible trad ? Or lose your sensible marbles altogether and go M3W.
Lifes too short not to.
