I am zoned for Cashell ES, Redland MS and Magruder HS. Can't speak for Sequoya (though Ive heard good things) but Redland MS has a newish Principal that everyone loves (my son is an 8th grader there and doesnt have any complaints) and Magruder is a solid HS...
As far as swimming, I would look at Flower Valley neighborhood pool or Norbeck Country Club (they have social memberships so you don't have to pay the bigger bucks for Tennis or Golf)...