To apply, or not to apply?

For a while now I have been considering applying for a spot at the ASMSA (Arkansas School For Mathematics, Sciences and the Arts).
It’s a two year, residential public high school for advanced juniors and seniors interested in fields concerning Mathematics, science, and the like. It’s located in Hot Springs Arkansas.
Look around the site for a minute if you like.

http://www.asmsa.org/

Now, I’m the top of my class. Of like 40 people. At a verrrry small school. With like 250 people. Which doesn’t make me sound that smart. But I digress.
ASMSA is a REALLY good school with classes that I have never heard of. No, really. People interested in going apply their sophmore year (which I’m in right now). During the early application phase that I plan on taking part in, applicants get to spend the night in the dorms and attend a few of the classes they’re interested in, after which they are interviewed.
If I was to apply and actually get accepted (Not everyone does…I know someone that didn’t get to go), then I would leave behind friends who I have had as long as I can remember, my spot for val. at my school’s graduation, and my chances to be a completer in the few subject areas that we have at our tiny school. However, I will be able to take part in my school’s graduation and prom as long as they don’t fall on the date of a required ASMSA activity, and I can still be an honor student if ASMSA sends my school a letter. What do you think…Better to be a big person at a small school, or just another person at a big school?
If I go to ASMSA, I’ll have better classes. And become more social. But I’ll leave behind my family, who I’ll see just on the weekends. I’ll be 2 hours away from everyone I know. :[
I don’t know if I’m smart enough. I have a 4.0 and a 27 on my ACT, which is information that has to be turned in the application.

What do you all think I should do?