Rookie,
Do you still have your Commercial Elctrician job, and would you be okay staying there if you had some PLC training?
Do you want to keep being an electrician, or do you want to only do PLC programming? "Working with PLCs as a full time job" sounds very close to giving up electrician work and becoming something else entirely, a programmer or integrater in an office-type environment, working from specifications and drawings and customer phone calls to develop programs to do the customer's job, to run his plant or project, with maybe a trip to the field to trouble-shoot or for final check-out.
Training for the two different jobs is a lot different. I don't think there are too many Electricians that work with PLCs as a full-time job. Maybe a few do. Many electricians specialize in PLCs and are usually the guy in charge of wiring up and trouble-shooting the PLC part of any project. But still they wouldn't be doing it full-time.