A couple of questions: Are you currently a certified paramedic? how old are you? do you have anything holding you down to your current location (wife, kids, house/mortgage, etc)?
Where do you WANT to live? anywhere? King County Medic One pays really well, but you have to go back through their medic program, which is a deal breaker for many. Do you want a job (ie, a starting point to gain experience before you move onto something else) or a career, where you can be at for the next 20 years? You want to work in the big cities, or in the rural areas? what about the suburbs? how busy do you want to be? As a new medic, how slow can you tolerate?
https://www.medic911.com/ is Mecklenburg EMS in Charlotte NC. Busy system, Charlotte is a big city, and it's a great place to gain experience. But they have major turnover problems as a result, with people leaving for other agencies.
http://wakeems.com is Wake County EMS in Raleigh NC. Busy system, Raleigh is a big city, but outside of downtown, it retains its feel as a large town. Great place for new medics. But recently they have experienced major turnover problems, with people leaving for other agencies, or going on to other careers.
Those are the two big ones I know of in NC, but there are plenty of smaller agencies that are as good or better (but the pay might not be as good as in the large metro areas). But it also depends on what you are looking for
I've heard great things about some of the EMS agencies in Texas, and spend 15 years working EMS in NJ (hard to match the experience of working on a 911 ambulance doing 6-12 runs in a 12 hour shift, or in a paramedic flycar where you intubate someone every other week because you only see sick patients).
Cost of living is also a factor, so while the North East and north West US might have better salaries, how much is housing and other expenses?
Assuming you relocate for a job, if it doesn't work out, then what? what other options do you have? are their other jobs you can do in that area, or will you need to move again?
Most large agencies are always hiring. They hire every year, or every 3-6 months. small agencies don't, but that doesn't mean the smaller agencies aren't better places to work. And take every recommendation or horror story with a grain of salt; just because it didn't work out for one person, doesn't mean the system sucks, only that the system and that person were not a good fit.
So the real question is, where do you want end up in 5 year?