I also have a six year old. I really didn't want to move back to Boca (I am from Boca), but after talking to schools all over South Florida it seemed like the best place, overall, for him and I am planning to move back very soon (he is in private school now). I have been shopping the gifted programs, but the reputation of Verde Elementary is so strong across the board that I have strongly considered that district. Overall I think that Verde is the strongest of the schools I have talked to - but they send the gifted kids to Del Prado.
Water's Edge Elementary is a blue ribbon school which means their FCAT scores are extremely high, and if I were willing to live all the way west I would certainly consider it, although I do hear that the kids there have a lot of homework and that is not what I want to spend our evenings doing (caveat - this might be a rumor). All of the new Elementary schools out west appear to have good reputations. I have heard mixed things about Calusa and JC Mitchell, and generally have not heard great things about Boca Elementary.
For our family, Addison Mizner Elementary appeared to be the best fit, and the neighborhoods that go there are lovely. If he were not going into the gifted program I would have definitely gone with Verde, and that district is very centrally located.
i could not get a good read on Del Prado. It seems people either rave about it or rage about it. It was the school i wanted initially.
this link will show you which schools for which addresses, and if you select an address in the district it will show you also the borders of the district.
School Locator
City data's home page has information on each school's test results, and great schools has parent reviews. i would take all that with a grain of salt, however, and actually talk to the schools to get a feel for which one you like. I read the third and fifth grade FCAT sample tests the other night and don't think it is very well written, overall, so who knows what it really measures.
i hope that isn't confusing, but I spent the summer learning about schools!