Most of the work I do involves landscape, hiking, street (low light), and macro photography. In addition to the 100mm macro, I'm pretty well covered between the 10 to 85 mm range on my crop camera.

Although I own the 75-300 canon kit lens. Its image quality and performance are not par with my other lenses and the results are mediocre at best. I looked at the 70-300 sigma or canon, 70-200 f4/f2.8 Canons and Sigma.

My question is that If i want to add a good lens to my arsenal that covers the 70+ range that would help in street/walking, landscape, and hiking(Wildlife-ish) photography as well as in landscapes , what would you recommend?

The goal is to spend around $500-$600 on something with great image quality. If alternatively, I have to save up for the 70-200 2.8 IS L that's ok as well.

Your thoughts?