Don,
When you don't have a ton of coin & your lifelong dream car is there in your driveway, I can understand the anxiety - but only to a point. It stops being a "dream" car & becomes a "nightmare" instead. The idea of the 911 is to enhance your life, not detract from it.
My '84 is a very nice part of my life. But it's not supposed to make me crazy, it's supposed to help keep me sane as I go through midlife.
Seriously though, do what you can within reason, and learn to let go of the stress. It's a nice car, but it is a CAR. Replaceable. Mental Good Health isn't replaceable.