Hi Liz - Welcome to the area!
St Agnes puts you into an interesting area because you can choose to be close to Baltimore proper, or head towards Columbia or Ellicott City - which both have great reputations for schools, community and quality of life. They are also the mid-point between Baltimore & DC. So you get the best of both worlds :)
Here are two articles that might help you delve into the areas a bit:
Of course, as many of the other folks who responded reiterated - it always comes down to your affordability, what you are looking to spend each month on a mortgage or rent, size and type of house, # of br's and ba's, etc. If you are new to the area, I would absolutely recommend scheduling an appointment with a local realtor to have a consultation about your specific needs and hopefully identify the areas that will work best for you.
Good luck to you and your search! Feel free to contact me if you would like to discuss any of this further!
Prudential PenFed Realty
Roland Park Office