Not to throw a monkey wrench into your thinking, but if macro is one of your things, are you sure you want FF? I do more macro than anything and am planning to replace my 50D next year, so I have thought a lot about this. Here is my take:
FF gives you better high-ISO noise performance. I would love to have that, but not for macro, which I often do with diffused flash or on a tripod.
FF will do better if you print very large. I don't. I've been printing 11 x 14 and plan to do 13 x 19, but that is about it for me.
FF will do better if you want to go very wide. I don't. I am very happy with my 15-85 for landscapes, but I can go somewhat wider with a crop if I want to.
FF will give you narrower DOF, by about a stop, which is helpful if you are shooting at wide apertures and want the extra separation. I don't need it.
FF has a higher minimum diffraction-limiting aperture--if I am right, by somewhat over a stop comparing the 7D and 5D MK II or II. If the new 7D rumored for next year has even higher pixel density, this contrast will be greater. I would very much like this aspect of FF.
For macro, at minimum working distance, shooting at 1:1, a FF is not as good, in that it will give you a lot fewer pixels on the subject because of the much higher pixel density of the crop sensor cameras. For example, say you had a subject that at MWD exactly filled the sensor of your 50D, giving you 15 MP. If my arithmetic is correct, this would fill (1/1.6)^2==39% of a FF sensor. On a 5DMKII, that would give you .391 x 21.1 = 8.3MP. The comparison would be more extreme with a 7D.
FF gives you much less reach for a given FF. People will say that you can get the same FOV with a FF by cropping, and that is exactly right, but gain, with half as many pixels as your 50D.
I want better AF than my 50D, which means either a 7D or a 5D MK III.
FF is much more expensive, all other things being equal (e.g., for fast AF, 7D vs. 5D Mk III), and that difference could go into other stuff, like more glass.
So, I decided to hang tight and see if the rumors of a 7D II this year are correct. The rumors are around 21 MP very fast burst rates, and less noise than the current 7D (which is not all that much better than our current cameras). The rumors may be nonsense, of course. If the 7D II is as rumored, I will probably buy it. If not, the decision is not an easy one, at least for me.
Just my two cents. Lots of folks will disagree. But IMHO, it is not an entirely easy choice.