« on: August 08, 2013, 12:25:31 PM »
I am glad to see that others mentioned the 6D & 24-105 combo. They are also correct in saying that you will be amazed at the difference. Since you mentioned that you have some time, I would recommend signing up to the canonpricewatch.com website. When I'm about to purchase an item, I always check the current prices listed on the canonrumors price watch page, but I also sign up for an email update from canonpricewatch. If you want only new gear the 6D for $1500 sounds amazing, but if you don't mind used or refurb (which is how I purchase about half of my lenses and 3/4 of my camera bodies), then I would sign up, and pick one up when the price hits your goal.
Regarding the camera choice:
I've owed a rebel (t1i), and currently work with the 60D, 7D, and 5Dii. I am by far the happiest with the FF for a multitude of reasons, I like the 7D, but honestly, it suites my needs about as well as my 60D. Again, since you already have a crop frame that you plan on keeping, I would look into a FF 6D or used 5Dii (or 5Diii if you're feeling spunky). The combo of FF and 1.6 can open many doors when you start adding more lenses.
Regarding the lens choice:
Like others, I would not recommend the 18-135, however, I would also not recommend the 70-300. I know many have had great success with both, and though I can only speak for the 70-300 having owned it, the lens never performed for me regarding image quality, speed, accuracy, etc. I may have had a bad copy, but I didn't hesitate to sell it. the 24-105 should be plenty wide enough on the 6D and fairly narrow on the 40D. If you need something faster for low light, you can pick up a 50 1.8ii or 1.4 for not too much.
I hope this helps, and have fun!