WTB Midrange Lens

[Flyguytki]

I am looking for a lens range anywhere in between 17 and 135mm that is an IS or L lens, I already have a 28-135, a 18-55, and a 50mm So i am not interested in any of those. My price range would max out at $500, I would love a 24-105 but just cant afford that unless someone would be interested in a trade with some cash included. Let me know what you might have for me.

Thanks alot
-david