I own a 50D. I bought a 24-105L from a member here because of many good reviews, and nice photos I've seen on flickr. After using the lens for a few months, I have slowly realized that f/4 is no good for most of the indoor events that I go to, and switch to my 50mm.
Now I know some might think, trading an L lens for an EF-S lens sounds unrealistic and crazy... I've read many many good things about the 17-55, especially on crop cameras. I've done a bit of research and found out that they are close in price, and it might be a good decision for me to trade my 24-105 away for it. Can I receive some advice or reasons why I should rather keep the L lens? Or maybe if I trade it away, should I ask for a bit of cash from the other side?
Thank you.

