What lens next for a 450D owner?

I have a Sigma 10-20mm and nifty-fifty. I also have the kit 18-55mm and 55-250mm lens combo that came with the camera. I not looking to go FF any time soon.

Would the 24-105L be the most logical lens to add to this combo (I would sell the kit lens' to partially offset the cost). Would I be endlessly swapping lens with this combo? Or should I just add the 17-55 f2.8?

What will you be shooting?

Are you disappointed with any of your lens? Does one let you down - do you want more IQ, range, low light capabilities?

You've a good set-up for most things. I've found the kit 18-55 pretty decent, and question spending the extra to upgrade it slightly.

How about a faster prime in the telephoto end? 85/135? How about a flash? Tripod/monopod?

Perhaps you'd like to try something new? Like the 60 or 100mm macro lenses?

I know the 100mm is on the top of my lens to-buy list.

If you're not planning on full-frame, I would go with a 17-55 over the 24-105, but would choose a better and more affordable prime over either

the next lens that i purchsed after my kit lens was the 55-250mm...no complaints whatsoever good IQ

Look at the 70-200 f/4L. That would make a great set up with your 10-22, 50 and then that. I'd sell the other two lenses.

J.

Why do you want another lens? You have a good kit already. What's lacking?

If you don't have a flash, get that next.