I'm in the exact same boat. Accepted to American (50% merit aid), Georgetown (50% merit aid), George Washington (no merit aid), and George Mason ($5K first year only, in-state tuition).
I'm having a tough time with the decision. I plan on doing the part-time program and likely staying in my current employment after completion of the program, for at least the near future. I'm not as concerned about employment prospects, but more so looking for a curriculum that matches what I am interested, and, of course, a price point that makes sense. Will probably be going right up to the deadline with this decision...