Look into Maddox which is very popular. Diener has an early K class -- great student/teacher ratio so the kiddos get lots of individualized attention. Beth Ami is starting a K class - not sure of the target population. I believe JCC and Washington Hebrew also have K classes -again, not sure of target. Finally, many people used to mention Children's Learning Center in Rockville a lot. Although a few of the schools are religious, they are open to everyone.