Welcome to werkz. I again ask: Taos, NM? I have been there. I like it. Nice place.
I think the 745i should suffice. It is a nice vehicle already. I have seen the picture in your sig and I think your money can be spent better.
Congratulations on winning the lottery. I hope you are not paying cash for all these things. The best thing would be do put in a good down payment, and then put your money to work, so that you make more money than you lose by paying interest.
I do not what your profession is, but I would suggest that while you can afford it, you leave your job for a short while and go to school. Study something in business, economics, finance, or a related field. You can explain your situation to an adviser at a university and they can tell you what currciculum can best help you learn how to take good care of your money. I am sure you shall be able to afford the best of educations. You may already have 3 PhD's, so I apologize if in any way my advice was perceived as bellitering.
Once again, welcome to werk. Show us some pics of your car, and enjoy the BMW life.