Well currently, like apply today, you have both Fairfax County and Prince William County VA both hiring for Firefighter/EMT's and their process just opened up. Fairfax is the best paid department in the NOVA area, and Prince William is a close second. Starting salary is 53,732 at Fairfax with a top out just as a EMT of 87,525.... Best thing about those departments is their retirement. Process is competitive, however coming from where you are, and having a clean background it should be an easy process. They are both extremely progressive departments with tons of options for growth, training, and advancement. I know Paramedics who are Captains in those departments easily making 150k with some overtime.
Arlington County also hires EMS only people, however they are currently not hiring. Arlington and Alexandria are also great places to work.
There is also Montgomery County MD, which is an excellent department to work for, and Prince George's, which has one of the best retirement programs around and catches alot of fire.
If you are looking for a quality EMS only job, and not interested in being a firefighter, I would stray away from the DC/MD/Northern VA area, HOWEVER once hired in one of the departments listed above, your could most certainly ride a ambulance/medic unit your entire career if that is what you're in search of. Plenty of PM/FF like myself would be willing to give up my medic time for engine time.......