Lot's of great choices... Simms, Patagonia, Cloudveil, even high end Orvis or LL Bean (Bean has the best return policy
on the planet), just depends on how much you want to spend. If you are going to layer under them for colder adventures, take layers with you and make sure you buy them big enough... and think about buying your boots a size bigger as well... you can wear heavy socks in the summer without getting hot (standing in cool water in breathable waders)... but you can't do without them when it's cold.
... But a lifelong journey.
I choose fly rods the same way I do women, motorcycles, and cowboy boots...
go with what ever feels good, and keep on hand as many as I can afford