Hi L.,
I grew up in Bellport, and now I own a house in Patchogue (both are near Brookhaven). I went to the South Country School District, and I didn't think it was that bad. The students are quite diverse, because North Bellport has a lot of poor minority families, while Bellport Village has a lot of rich white families... and all the neighboring areas are mostly middle class - all different races. I hear bad stuff about South Country, but having gone there myself, I feel that a lot of it is just that it has a bad reputation. The district has 3 different elementary schools (Brookhaven, Verne Critz and Kreamer Street), your kids go to whatever school is closest. That is K - 3. I think Pre-K is available, but I'm not sure. Then the students from all 3 schools go to Frank P. Long School for 4th & 5th grade (yes, that is really the name!). Bellport Middle School is 6-8 and Bellport High School is 9 - 12. The only private schools that I know of in the area are Catholic Schools and I'm guessing that they can be a bit pricey. You mentioned "area horizon." I'm not positive, but I think that is a small community of big, beautiful homes (lucky you!).
Yes, there is some crime, but I think that most of it is contained to the North Bellport area. If I thought that our school district was really that terrible, I wouldn't have bought a house in the area. But I am planning on sending my children there.
Please feel free to contact me with any questions. I've lived here my whole life and I am familiar with the area. Best of luck to you!