If you have a lot of accessories and lenses, it's probably best to stick with the Canon line of cameras if it lets you keep using the accessories. Other than that, I can't be much help since my camera is the Canon EOS Rebel T3i which is probably a mere generation newer than yours. I'm happy with it and people like the pictures I take. The auto-focus is lousy but I'm a mostly a manual sort of photographer and like to have full control over everything.
Why do you want to upgrade? Is the camera just wearing out or did you want more resolution or are there special features you want?
1812 cannons are so dated. The US navy is starting to outfit railguns on their destroyers so I'll nominate those for first place.
