Why do you need a FF? What are you missing on your current camera? The 60D is a great camera. Especially if you don't have the option of buying and selling used equipment, going FF is going to be expencive.
What I think you are missing is something in the wider end and something in the tele end. You should definitely keep the 50. My experience is that F4 is not fast enough for low light indoor photos. But again I live in Norway, and I'm guessing Brazil is a bit lighter
1. You can go for the 17-40 (it's a great value), but you don't have the big aperture
2. Get a wider prime (ex. around 24-35mm) like the Sigma 30mm F1.4 and get the 70-200mm F4L NON-IS. The combo is slightly more expensive, but both are pretty good lenses. The 70-200 is really sharp and the 30mm has a wide aperture.
The 50 you've got is a good portrait lens.
The 60D lacks AFMA. Getting fast primes to match it well is hard. If he is looking to use fast primes, a different body (crop or FF) with AFMA would be important. I did not realize how much sharper my lenses were until I switched to a body that had AFMA. It mattered with f/2.8 lenses and it definitely matters more with f/1.2 or f/1.4 lenses.
Ah, that explains it. I usually focus manually, so I haven't felt the need to adjust the AF.
So camera body choices would be: correct me if I'm wrong
- 5D Mark II
- 1D Mark III
- 5D Mark III
- 1D Mark IV
The final choice is personal and depending on budget, AF needs, weather sealing, ISO, Crop or FF etc. If you can't buy used, some of these will be out of the question (5D2, 1D3, 1D4).
as i were you, i would not list 1d mark iii as an option, but 1ds mark iii