This has got to be one of the best times to buy. ibanker is correct about the Fed's "Band Aid", it has less to do with mortgages than the general public thinks. It is more about consumer confidence and getting more money in circulation than anything else. To many people are discoured to buy right now because of what they here in the media. The media often gives you a lot of statistics and averages, BUT they often fail to say a key word..."NATIONAL". A national average is completely different than a "LOCAL" Average. Right now Local Averages are all over the place. Very area specific so to say. For MOST places inside the beltway, prices have remained steady. For MOST places outside the beltway, prices have dropped substantially. HOWEVER, you really need to make up your own mind and see if it the right time to buy or sell for you and what your needs and wants are. For this, you should definately consult a REALTOR to get you ALL the facts.
Back to the origional question about the new metro line...providing that everyone gets their acts together, the metrorail should reach reston by 2012, Dulles Airport by 2017/2018 and Ashburn by 2022.
Any decision to buy or sell around a metro station is a wise one and will always keep its value, However...if you try to "TIME" the market around the schedule of the metrorail...you might get burned if you decide to wait too long. Interest rates may go up only 1/4 to 1 % and then all of a sudden, you realize the "DREAM HOME" you wanted, you can no longer afford because interest rates went up. OOPPS.
For more information on how interest rates can effect your buying power, you should consult a Lender
For more information on area housing price trends, you should consult a REALTOR.
also...for more Real Estate knowledge, check out my website at www.forsalebyPatrick.com