The only ones on your list I have not owned -- or even heard to my memory -- are the MS-Pros. I mostly agree with aerius in that the SA5000 sounds pretty bad compared to even decent high-end cans. They are tizzy and lack weight, though very comfortable.
The RS-1 is a beautiful headphone in all respects, but not the most comfortable. Very light but they sit on your ears just like all the other Grados besides GS-1K. The MS-Pro apparently smooths them out a little but I don't really need that. I like my brown leather beauties the way they are.
The AD2000 is another can I still own and really like. Warm but still detailed, very comfortable, and very open, on the open-can scale. I use them at work because I can still hear the phone. Really good deal imo.
K601 I had and sold, but they are a nice can. I like the look much more than K701s, which I still own (x2 actually, s/e and black dragon balanced). They are darker and maybe warmer than the 701s and the problem is that their resolution isn't very high. At maybe similar price points, I would go with AD2K.
Cheers.