I have 2 toons in 4pc t10 sets. My main busts out 9k+ on some fights and my ele does pretty respectable.
10/12 in 25, 11/12 in 10 for my main.
That being said, I've never used the GS mod, much less know what my toons have. I think it's a decent barometer for raid leaders, sure, but if you have any relevant achievements, 10 or 25, they're just as good as an arbitrary number that isn't always congruous with skill. Most iLvl 200 trinks are still better than most of the 232 ones and stat-itemization>score.
I can't wait for Cata so I can hopefully stop having to use a spreadsheet to play a game... there's something about having to regem every time they tweak things around as a rogue that's driving me nuts...
oh, and subtlety backstab will supposedly become a viable raid build.. o_0