Depends how keen you want to get and what the budget is. I shot for years using a 70-200 f2.8L - still my favourite lens - before investing in a large prime. I really went mad and bought a 400 f2.8, but even the 300 f4 produces stunning results, better than you'll ever get out of a zoom.
I second the comments about a circular polariser. I never take it off.
So - depending on your budget - 70-200 f2.8 first, 7D body next, prime lens after that.
There! I've kept you poor for years!!
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