I'm not at all well off but when I was buying my rifle decided to get something that would do for everything and would not require replacing in my lifetime, hopefully. So I saved up and bought a Blaser R93 in 308W.
If I came upon similar money to what I spent on the Blaser, or even what would buy one today then I'd head for Scotland, maybe over several trips, and spend it on red stags and hinds. Before I'd do that I'm pretty certain I'd look at fancy binos, and fancy variable scopes and maybe even a rifle or two but in the end I don't need any more than what I've got.
If I won the £160 million lottery then I still wouldn't buy another rifle - I'd buy Amhuinnsuidhe. It has bankrupted every single person who has touched it but I'm of an age where I think £160 million might just keep me there until the end of my days; or at least until I could no longer get up the Clisham.