It was good to see, your experience. But let me make one point clear, PMI methodologies is platform independant. The process is modified to suit the client's need and also at same time quality should not be lost, that is best & tough changle in anyone's career.
I agree partical that if a person has a domain knowledge in the given business field is really value added to your work.'
Business Oriented Projects ---- ERP application (SAP,Peoplesoft,JD Edwards, Oracle Finicals,).
MRP ----PRMS, BPCS, etc..
Few smaller are MOVEX
Legacy application are what most of banking & insurance & logistics industry use ----MainFrame , AS/400 or ISERIES, etc...
So my dear:
First you have think , which doamin is your favorite?
Which suits your career, curently you are working?
Each doamin has a certification?
This will give you business knowledge and club with your PMI methodologies gives you a deadly weapon to sell yourself.