Leaving at 6 AM in the morning, it takes me about 45 min to get to the Reston exit, via the Greenway and Toll Road. We are in Middleburg, about 10 min drive north of the village. The time it takes you to go “x” number of miles around here can really depend on what time of day you leave. If I left at 7 AM, it would probably take me 60+ minutes to get to Reston.
M’burg is great. Totally horsey, although some areas have gotten built up. It is, however, a very expensive area, and not part of the “forclosure” area that has hit other areas of northern VA. You can get an idea of real estate prices here: http://www.middleburgonline.com/realestate.html. Houses are usually ~$500k, and small farms usually start around $850k.
We are within 20 minutes of the fixtures of the following hunts: M’burg, Orange Co., Piedmont, Fairfax, Loudoun, Loudoun West, and Snickersville. It would be hard to recommend a hunt without knowing what kind of hunter you are. Are you (forgive my phrasing), “balls to the wall,” or out for a nice gallop? Do you need to have lots of things to jump all the time, or happy with more time to watch hounds work? Etc. Also, some hunts have restrictions (OCH requires you have 50+ acres in their territory ($$$$), Piedmont is limiting members because their fields have gotten so big, etc., so where you live can have an impact on what hunt you belong to.
If you are looking to board your horse, prices around here are generally $500-1000/month for full care, and $300-450 for field board, depending on where you are and the ameneties offered. Shoeing is generally about $185-200 for 4-'round steel, etc., etc. As I said, it’s an expensive area.