As has already been posted, if you want it buy it...(if you can afford it).
You state that you have had the 60D for three weeks, which is about the time the 5Diii was released (22/04/12), maybe you should question why you didn't buy it then, you state you love the 5Diii, but you haven't been using it...are you sure it's not gear envy?
The 5Diii is a great camera, but for what and how much you shoot I think the 60D will fill your needs.
I use a 7D as well as a 5Diii, high ISO noise on the 7D can sometimes be annoying, but if technique is correct (exposure) with some PP in LR/PS/DPP etc the noise can be dealt with.