I'm never satisfied.
Even when i like the individual pieces that i own, the problem is that no single item is 'perfect' or ideal, and so it necessitates other items.
For example, i love the Nikon F6. It does everything i could ever need it to do, and far more. But, it's large. So, i have a Contax G2. Great lenses, great size. AF. But, the viewfinder is too small. So, i have a Nikon FE2. Great size, great viewfinder, great 'experience' in use, but no AF or winder.
I have a Hasselblad 203FE. Maybe the best 6x6 SLR ever made. But, it's heavy-ish, and not really comfortable to carry around.
Canon 5DMkII. Great camera. But, it's digital. Canon 35L, 50L, 85L - amazing lenses, but they're large....
So, i have some of the best stuff ever designed. But, if just one camera were perfect, i wouldn't need the others. Maybe i don't understand the question. Maybe i don't understand the responses. If you're happy with what you have, shouldn't you only need that one thing? Having a few different solutions seems to imply that you're only 'content' with each thing, and that you're happy only with the sum of all those things.
Whatever. I clearly have a character defect. The camera(s) that would make me truly happy don't and can't exist. The same goes for women.... Which is why i'm a very unhappy, lonely person.... With a bunch of cameras.