I think I posted to you before, so I apologize if this is a repeat. In my opinion, you need to go to a pulmonologist if you have daily sputum production for more than three months and recurrent infections. You will need a high resolution chest CT Scan to determine whether you have bronchiectasis, chronic bronchitis or asthma/emphysema. A sinus CT can also help determine if your chest cough is caused by post nasal drip rather than or in addition to lung inflammation.
My X-rays look normal sometimes, so if you've had normal x-rays that doesn't mean much. (My CT scans do not look normal.)
I understand that you want to get to the bottom of the CF question, so I would get the Amplified panel if I were you. But 50% of people with bronchiectasis do not have CF (I would love to know what % really do, but just don't know it), but plenty have other conditions or no clear explanation for why they present with lung damage.
The two difference you would have btw bronchiectasis care vs CF care, as far as I can tell, are 1) you would not likely do pulmozyme because a study showed it did not help people with non-CF bronchiectasis. That said, I know of a few non-CFers who are on it, and 2) your care might not be as well coordinated unless you went to a CF Center and depending on your insurance, you may not get coverage for the Vest.
Because you already go to a CF center for your son, you should go there for your lung disease too, if possible and if that is what you have. Finding a non-CF pulmonologist who is knowledgeable and interested in bronchiectasis is not a no-brainer. AND the office staff is CRUCIAL--they have to understand that you should not come in every time you need a new antibiotic or you'd be there ever two weeks. And they have to work with you about faxing slips to labs and giving you extra sputum cups to have handy when you get an exacerbation. Some office people are downright mean when you seem to be asking for these "special favors." I suspect that is not the case at a CF center...
And I agree wholeheartedly with Piper that you can buy the vest part of the Vest, and people who are pneumonia- and bronchitis-prone should learn postural drainage and find a family member to learn CPT if possible.