Yes sir, vatsim is cool.  ATC simulators just don't offer confused pilots real world weather and supervisors.  The voice structure in vatsim and the REAL PEOPLE you are talking to make it so much more rewarding.  I too have tried all the simulators even London Control and the first time I pumped iron to score a 95 grade I realized it was missing something very significant.  Real airplanes don't get your instructions always on the first try and copy some frequencies and altitudes and headings in the clearance a bit on the incorrect side......It's more rewarding helping the student pilots also who even give us student controllers some help.  Team work is the game in aviation sims.  Seattle center is beefing up our controller base and trying to give real world like support to the seasoned as well as newbie pilots.  Come fly with us.  We are even building our VFR opportunities so if you lack IFR skills you are most welcome to check us out and maybe fly the pattern for a while.  Watch for EVENTS at Seattle Center.....they have been good ones.