Yay for all of your people moving to DC!!!
Columbia Heights /Adams Morgan is a pretty good neighborhood and depending on how close to U st you are, its pretty safe and quite gay... lol.
I already brokered one housing arrangement (involving a friend from RJ who moved from Chi to DC) this summer - so I'm afraid its unlikely I can help anyone else! lol. I CAN however give ya'll all the info you need about the neighborhoods....
Logan is good - its getting pricier but still affordable if you live east of 14th street (ie...13th, 12th, 11th). The "Gayborhood" is generally accepted as anywhere north of Mass Ave, south of U st, and between 19th and 11th sts, NW.
I live downtown in Chinatown / Penn Quarter... which is a very nice area with lots to do but its not very gay. Holler at me if any of you have questionshttp://upload.wikimedia.org/wikipedia/commons/9/93/DC_neighborhoods_map.png
PS congrats on going to GW! That's where I am for grad school too!
If you have any questions about navigating the area..... let me know. Ive been at GW for 6 years all together.... so, I know it quite well. lol.