Lower Merion,Radnor,Tredyffrin-eastown,Great Valley are the best school districts in that area. They are all fabulous, I honestly dont think you need private schools. If you are leaning towards private schools Episcopal Academy is probably the best in the region. There is also an excellent Catholic school sytem in the area.
Towns/areas to check out.
Radnor
Wayne
Berwyn
Villanova
Haverford
Ardmore
Narberth
Bryn Mawr
Penn Valley
Gladwyne
Tredyffrin
Gulph Mills
Great Valley
Malvern
Chester Springs
Good luck
http://www.weichert.com is a good real estate site to give you an idea what your money can buy.