Okay, I'm looking to round out my lens collection. Currently, I have the following: Canon 40D Tamron 28-75 f/2.8 Canon 85 f/1.8 Canon 100-400 f/4.5-5.6L I want something below the 28 that I can use for the wide angle shots (obviously), but I'm not enthralled with the 10-22 as it doesn't seem like a great value to me (slower and expensive with good IQ). I've been looking at used 17-40s and they seem like a good mix of quality/price/speed, but I don't know if the low end is low enough. As of now I don't take a lot of landscape shots, but I'd like to explore this aspect. The 16-35s are more than I want to spend, but may be where I need to go. Thoughts? Thanks in advance.