I also have to go to DC a few days a week for my job, but only into northern DC, not all the way into downtown. For my case, commuting is quite easy; I just take US 29 all the way down to 16th St NW.

If you have to go all the way into downtown, you could consider the option of driving to Glenmont Metro Station (Red Line) or Greenbelt Station (Green/Yellow Line) and taking the Metro the rest of the way in, depending on how much you hate driving in rush hour, and where your work is located.