As neuro said, 24-x might not be wide enough for APS-C cameras, especially if you're doing landscape shots. My motto is "you can always crop, but you can't fake a wide-angle lens". Consider the 17-55 or adding the 10-22 after your 24-105. I've learned to live with the 16-35 on my crop cameras; I can't "get close", but I can always crop close.


I'd stay away from the 28-105. If it isn't discontinued, it probably will be soon. You can get the 28-135 (with IS) for no more than $200 anywhere. Perhaps the answer is a 10-22 and a 28-135.


Especially for new photographers, I recommend that you primarily discuss/debate only the next lens purchase, not the next next purchase. Don't worry about your telephoto choice just yet - get your first lens chosen, use it, learn it intimately, and then decide what you need next. You say you want to do low-light wildlife, so you may need f/2.8. For the stationary geology features, you'd want IS and/or a good tripod. For macro, just buy an extension tube. But all of that is for the future.