Daniel averages about $4,000 per hour playing in the high limit cash games. It is obvious that some of you have never observed (0r played in) the 4/8k game, but it is very rare to have more than 1-2 non-professional player at that table. Here is a post from Daniel about the money he makes playing this cash game.
I personally prefer to play the 100/200 NL game because I think it keeps me fresh for tourney play and I have a substantial hourly profit. I have played the 1500/3000 tables, but I make a lot more money at the NL table.