One thing you will notice when you upgrade from your 300D is how much bigger many of the new cameras are. This may or may not be a big deal to you, but it is definitely worth while to hold ALL the cameras that you can get your hands on.
I went from a rebel XTi to a Canon 40D to a 5D Mark II, and although the 5D Mark II is the best of the lot (on paper), I rarely used it because it was much heavier than the other two for me to be lugging around. I used the 40D much more, especially on vacation. Recently I sold my 5D Mark II and instead of upgrading to the 5D Mark III, I side-graded to the 6D. The 6D is essentially the exact same camera as the 5D Mark II, but in a much smaller/lighter body. It's even lighter than my 40D. So now my 40D sees no action and I use my 6D exclusively.
But not everyone is a pansy like I am and don't mind lugging around a brick.
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