@grudas
Do my eyes deceive me!!!!!???
You got a good price the GS 2 there.
You pretty much got it spot on there and Robbo included the other main points missing. Also the NLED is better on the galaxy nexus and the battery is removable in the GN (might be an advantage for you or not)
Another factor, which might be important for you is the developing community. The one S community is
ok, not very large but the ROM's available seem to be done to a pretty good standard and iirc CM 10 is pretty much fully working missing a few minor features and there are a lot of good mods, like the camera mod etc. But being a nexus/google device, the community will be much better and there will be more choice for ROMs.
Personally I wouldn't really be buying anything just yet though (unless you really need one now) as you have a lot of new phones coming out, which look very good.
EDIT:
Just remember to check what your coverage is like for your home, work, friends houses areas etc. as the S isn't great in areas where you get weak reception. This should be solved/improved in the 4.0.4 update, no idea when we will be getting that update though, in theory it should be by the end of this month........
EDIT 2:
Another advantage of the S, it has GLONASS (more accurate and faster lock on GPS). I don't think the GN has this.....