I have pre-booked the new Canon D80 ( to be released later this month). I am new to canon and I have looked at lenses till my brain is in a fog. When I ordered my camera I also ordered the 18-135 lens. I now need to decide what other lenses I need in my bag. I shoot mainly nature shots, wildlife, wildflowers, landscapes, etc. I definitely want a good birding lens. I have talked to a couple of friends that shoot Canon and they both recommend I get the 70-200mm F2.8 IS II series and a convertor versus getting the 100-400mm lens. Your thoughts on this folks? Thanks in advance!