Just remember that the domicile issue is a legal thing as much as anything. Depending on what state you are in and where you think you want to domicile may make it easier or more complicated. If you are not going to be on Medicare when you retire, insurance may be a critical issue too and impact your decision. Looks like you live in PA now. Where are you thinking you want to claim as your permanent address?
Disclaimer….I am not an attorney but I did consult one when we decided. Ours was easier as we were Texans and decided to maintain domicile in TX using Escapees as our address.