I agree that the L glass is an upgrade, but what type of photography do you do? Is it overkill? I always found it useful to go over to PhotoSig and see what others where doing with the equipment I already have. If I couldn't do that, I knew I had learning to do before I needed new equipment. I did finally end up buying a Canon 20D (this was 5 years ago) and still use that camera because I haven't been able to push the limit to where I need something more. I have the 70-200 and love it, but make sure its worth the money in your type of photography.
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"Insanity is hereditary - you get it from your children." Sam Levenson
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