Lens

This is one of my weirder blips I am afraid. It's lens flare in my wide angle, which I am photographing to sell.

In fact, I have decided (dependant on sale prices) to replace all my lenses. Yes, my Canon 20-35mm F3.5-4.5 USM, my 28-135mm F3.5-5.6 USM IS, and my 70-200mm F4 L USM are all to go.

In their place will be the Canon 100-400mm f4 -5.6 L USM and yet undecided lens in the 24-100 range with a fixed F2.8. I would buy the Tamron AF SP 17-50mm f2.8, but 50mm is a bit short. Any suggestions?