Comment Change Employer (Score 1) 247
I don't know about other companies, but where I work (major financial services firm) "advancement" only means increased workload and responsibility -- it is not reflected in your paycheck. If you change employers you can expect a pay raise anyway (~15%), and you can argue for a bigger bump still to match your new responsibilities.
Leave on good terms, and you can always hop back to your previous employer in a few years to advance (in responsibility *and* in pay) again.