I dunno. If I won 5 mil after tax, I would probably only spend a million of it on a house. After all, there will be years and years of tax payments I would still need to make and first-class vacations I would be able to take.
That being said, I would probably either choose a large lot with the cheapest house in RSF (so I could build a huge garage for the purchase of more decadent cars), a decent house in the Temecula wine country (grape vines, huge garage, winery access), or just stay in my current area and move to La Plaza Drive in San Marcos. The third choice wouldn’t get me the huge garage probably, but the views, the tranquility, and the easy access to the things we love to do would be worth it. I could always buy land somewhere else for the garage. 🙂