It might help to provide a bit more detail about what your’e looking for. What level do you show at? Do you want to go to Florida for the winter/any other particular horse shows? What’s your budget? Do you want a full-service program?
There are somewhat limited options east of the District, but given your location and your commute, you would be very lucky if one of them if it matches your needs. The traffic is so much better than in any other direction, especially given the times you’d be driving. It’s hard to describe just how dreadful driving in this area can be until you’ve experienced rush hour for yourself.