Moxiemike said:You've done a lot of good research. I hate to hijack this thread but I'm gonna do it because i'm sure you can appreciate the info (as can any other DSLR owners).
The Sigma 12-24 is a nice bet. It's pretty comparable to Nikon's 12-24 (which i have and LOVE) but it's half the price. The speed of the lens shouldn't be an issue since you're dealing with mostly landscapey stuff and architecture with this lens.
My current lens setup, FYI, is the Nikkor 12-24, Sigma 24-70, 35mm, 50mm, 50mm macro, 70-200 + 1.4TC. The sigma 24-70, if you want that as an option, can be found on ebay for about $250 USD. For an f2.8 lens... that's pretty good.
For your wildlife kit, I'd go with:
The Nikkor 18-70 or Sigma 24-70 + 70-200 with 2.0TC for mostly wildlife and general portraiture and some architecture (interiors? you need th 12-24)
OR
Sigma 12-24, Nikon 35, 50, 85 and 70-200 with 2.0 TC if you plan on doing architecture and portraiture.
Does any of that make sense? Also, macmall has NICE deals on 1.0gb CF cards (80x WA which would suit your wildlife needs VERY well) for appx $120. I bought two. They ROCK.
i didn't like the 18-70 kit lens, which is why i ordered just the body without the lens
i really want that 12-24 mm focal length i feel that i do need it
i like the idea of getting the 35 rather then 28 and i'll go with the 50 1.8 rather then 1.4 since the price is so different
but i'm still torn between the 70 - 200 mm 2.8 i mean i would really love the extra speed but that 50 - 500 seems to call to me