Another thought that I've been perusing is a Sigma 70-200mm f2.8 [can be picked up second hand quite easily] and 2x converter. I used this set up on a Nikon D50/D70 and it was rather good. You have a fast 70-200 with HSM motor for good AF speed and when you pop on the 2x you've got the rough equivalent of a Sigma 135-400. Check the reviews on fredmiranda.com - the Sigma is a very good lens.
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