I have a few criteria for keeping a camera -> Do I have fun using it, is it intuitive, and is it reliable?
Everything else does not matter to me. Hasselblad 500 and Leica/Pentax 35mm stuff is all I need. But I confess to being mighty tempted to purchase a Rolleiflex, mainly for its portability for vacation shots.
Also, I find that the more gear I have the more difficult it is to learn how to use all of it intuitively, to the point that the camera isn't a consideration in my thought process when I shoot.
The Pentax KX and the Leica M2 all sort of 'disappear' from the chain of events as I shoot, and it's utterly wonderful to not have to think about the camera. It's just sort of automatic and I can focus all of my attention on the picture itself.
Good luck in your choices. But don't make a big deal out of it. Just enjoy, have fun, and let the good pictures come to you.