C.W.
Welcome to the area. My son goes to Timonium United Methodist preschool. this will be his third year there. They have a 3 morning a week and 5 morning a week program for 4 year olds. You can extend to 3P for an extra fee most days. The price of the program very reasonable. They are very loving and a lot of local moms have said wonderful things. They usually have openings at different points in the summer because a local elementary school opens up its preschool program to its local 4 year olds and several moms jump ship for the free elementary program. I have also heard great things about Havenwood in Lutherville.
We go see Amy Winkelstein at Maryland Pediatric Group and she is wonderful. The only draw back is that is very difficult to get an appt with her when your child is sick but there are lots of great docs in that practice that we have seen for sick visits.
Good luck to you on your move!