I currently have a Canon 60D with an 18-135 lens and a 24 mm f/2.8 lens I hardly use. I really fancy the 24-105L IS (colour, sharpness, etc) and the 100-400L for the length (Freud would have something to say here..).

Someone offered me to trade the two lenses I have for either a 17-40 L or a 70-200 f/4 L (non IS) and cover the rest with cash. I feel like these 2 would be a good enough focal length coverage for me, vs the 24-105. The only issue I have is the lack of IS. What do you guys think?

Some representative photos for what I take: http://500px.com/andreiblack.