I'd go with the 70-200mm f/4 non IS L if your budget is around $600. But if you can save up a little bit more, go for the 70-200mm f/4 IS L. IMO, it has a slightly better IQ than the non-IS version, and it'd be perfect for hiking, as it's much lighter than the f/2.8 IS L that you mentioned. I love my 70-200mm f/4 IS L. The IS is great when I need it, I've taken many shots with the IS version under low light situations (under 1/30s!). This wouldn't have been possible with the non-IS version, since it's a pretty long focal length (expecially on crop sensor). So I say wait a little long and go for the IS version. It'll be perfect for landscape, hiking because it's light, and good reach for wildlife. Good luck with your decision!