I started with a Cosina, then a pentax ME, then a nikon 401 (which got pinched), then I switched to canon and had a couple of EOS', most recently an EOS 50.
When I switched to digital I got a pre-loved 10D then upgraded to a silly price used 1D when I was working in New York a couple of years ago.
The new Nikons look amazing and the gadget magpie in me wants me to switch, but it wouldnt help me take better photos - I'm gonna stick with what I've got and learn to use it better.