The problem is that those that fit that bill for your 1st Defender will sell to people that have taken the time to research and learn everything and know it's a good deal and snap it up as soon as it hits the market.
I spent about 2.5 months lurking reading on this site and a couple of other Land Rover sites whenever I had a few free minutes. Even then I think I scratched the surface of what I need to know. Whether I got a good deal or not time will tell, but I can say the reliance on making a decision was on me. As you said, you got the money and time, so put in the effort. From everything I've read, purchasing it is just the beginning ... and I'm looking forward to the experience