http://www.realtor.com/realestateandhomes-detail/140-Southwood-Ave_Silver-Spring_MD_20901_M60278-36124
Northwood Four Corners is a safe area with good schools. I think you will find that a lot of people on this board would never live anywhere besides Bethesda or Potomac, but there is more to life than Bethesda or Potomac.
Check out the zip codes of 20901, 20902 and 20910 and then check out the schools in the neighborhoods.
Silver Spring, and Wheaton.
Some people like Olney or further out in Silver Spring, 20904, 20906
You don't have to live in Woodbridge or Manasses or Prince William County or really far out for 300K. The selection is less, but it is not nothing.