I used to play on KGS. It was a very nice server before the really weird and ridiculous changes in its TOS in Spring 2004; then I effectively stopped playing on KGS.
I tried to find an alternative server for a while, but I do not like the interface of IGS (better players on KGS, and the same social atmosphere nowadays). At this moment, I sometimes play on Cyberoro. We also used to have a local club meeting every Wednesday (but this is gone, too).
My level was 6-7k during the best days (2003, KGS ranking) but currently I am very rusty. Presently, 5k? on KGS (which is the same as 10k in 2003, I guess).