OK, I should have asked if you are concerned with schools or not. Generally, DC public schools are quite bad. There are some excellent charter schools in the district though, and some of the schools in affluent NW DC neighborhoods are good as well. In Virginia, Arlington, and Fairfax counties both have some great schools. In the MD suburbs Montgomery County has many good public schools.
Salary wise I am not sure how much someone with 8 or 9 years of experience is paid. Several years ago new grad pay at Georgetown I believe the pay was $28/hr. I am confident that both critical care and years of experience would bump that up but have no idea exactly how much. When I worked at G'town, I loved living in Rosslyn, VA. It the the part of Arlington immediatly across the Key Bridge from Georgetown, Foggy Bottom, and the bottom of the National Mall. Just a bit further up in Rosslyn is Clarendon which is great too. These ares have mostly condos, apartments, and a few super expensive town houses and homes. There are nice amenities, it is quite safe, and you are one stop via Metro from GW, the G'town shuttle picks up at the Rosslyn Metro station as well.
GW is hands down the most convinent location, but I haven't worked there so can't speak to the pay or environment. Georgetown is a place that I didn't fully appreciate until I saw a bit more of what is out there. They are a Magnet facility, and do a lot in terms of staff education and having opportunities to advance without leaving bedside nursing. Check out there clinical ladder. There are 2 or 3 ICU's and I would visit each unit to check out it's culture. The facilities are old and outdated. G'town is in an excellent neighborhood, but not easily accessible except by car and you have to pay for weekday parking. Neighborhoods close to the hospital are Georgetown, Foxhall, and Glover Park. All expensive, and all nice.
Suburb wise, in close-in Virginia, prices are around $800K that goes down as you get further out. The Maryland suburbs really aren't as convenient to G'town and GW in my opinion. GL!