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Although I have the 70-200 2.8L IS (and it works pretty well with a 1.4 extender, I'd go for the prime L lenses for Ap and birding. In AP, zooms introduce quite noticable image degradation, particularly at the corners.
If the 2.8s (300, 400) and f4s (500, 600) are beyond budget. Then as Phil suggested, the 400L f5.6 is a good performer but I would suggest either the 200 2.8L (non IS only, I think) or the 300 f4L IS.
It may also be worth looking into the old FD series telephotos, as: a) They have fantastic colour correction as they use pure Fuorite as one of the elements and b) they can be had for MUCH less than the EF-USM models.
There are a few posts around telling you how to build FD-EOS adapters and there may now be some available commercially that aren't rubbish.
Good Luck,
Peter
PS. I think there's an FD 300 2.8L on Astromart for about $US1000. That's about $4000 cheaper than the EF-USM model!
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