Kamasf,
We recently moved (last August) from Chadds Ford, PA to the West coast (hubby's job). My children were at Chadds Ford Elementary and we loved it! I would highly recommend the district. We attend a private school out here and both of my children are about a grade higher than what they are teaching at their current school, especially in reading. UCFSD school district is an amazing district and has unbelievable parent participation. The class sizes are small and the teachers are experienced before they are hired into the UCF district.
As far as Radley Run, it's a great neighborhood but yes you may endure some snobbiness, however that will come with any wealthy area school district. There is a reason some districts are better than others and the parents of students in UCFSD demand it to be tops. If you live in Radley your kids will attend Pocopson elementary. Honestly you can't go wrong with any of the elementary schools. When you ask about snobbiness, you are looking to move into a district where less than 2% of their students get free or assisted lunch - way below the national average. Obviously people with money live there and with that comes some snobbiness. You can look this info up on
GreatSchools - Public and Private School Ratings, Reviews and Parent Community. Pocopson is 2%, Hillendale is less than 1% and Chadds ford is blank (not sure what that means). Chadds Ford has the smallest class sizes with 13 to 1 ratio but only by 2-3 students. The district is unbelievable, it's very much like private school education. Your kids will get a fabulous FREE education, something that I am really envious of right now.
I think you will get more of the designer duds mentality when your children are in high school, and all elementary schools filter into the middle school and then to the high school. Basically whatever neighborhood you choose, eventually your children will be in school with the kids from the entire area. It's definitely a money area but I found the people to be genuine.
If you are really worried about the snobbiness you may want to check out Garnet Valley. We did all of our sports activities through BYC and the majority of those families are in the GVSD. Actually many of our good friends and those we remain in touch with are from the Garnet Valley school district. The taxes though are outrageous, but do have some really great families. We found Garnet Valley to be way more sports oriented, so if you are big into athletics you may want to consider moving over to the other side of 202.

I felt we had the best of both worlds. We were in the UCF school district but were close enough to do our sports in Garnet Valley. We lived in a neighborhood near St. Cornelius church. Our kids had two sets of friends so they were never competing on the field and in the classroom with the same kids. Sometimes when you do everything with the same people it can get a little claustrophobic. My kids were invited to birthday parties in both school districts. It was kind of refreshing actually to be with one set of kids in the AM and then another set in the PM for activities. When we moved we had two parties thrown for us, one with the Chadds Ford people and another with our Garnet Valley friends! Both great areas with some super people!
I hope you find what you are looking for - and I hope you enjoy the area as much as we did. We miss it a lot!