West Johnson is about 5 miles from my house! I don't have kids, but from secondhand info from some families in my church, it is a good school. It just opened in the last 2-3 years. Like most schools around here, though, it's probably close to being overcrowded. This area has exploded so much w/ people moving here that the school systems just can't keep up.
Regarding Clayton, the actual town, yes, there's not much to it. In fact, if you just drive through on Hwy 70, you don't even see "downtown". Most people who have a Clayton address don't even live in town. I have a Clayton address, a Smithfield telephone number, and I live about 8 miles from the Clayton city limits in one direction and about 15 miles from Smithfield in another direction (I live in what is called unofficially the Cleveland School area between Hwy 42 and 210right off I-40). Anyway, the town of Clayton is growing some. They got a Super
WalMart a couple of years ago. That's about the only place for clothing except for a couple of small shops in downtown. For most of your non-food shopping, you would need to head to either Garner, Raleigh or Smithfield (big outlet mall there) if it's not at or you don't wnat to go to WM.
My personal opinion, if you're used to bigger cities, I wouldn't go directly to Clayton; too much culture shock. I would head to Cary/Apex/Raleigh first. Then if you want to go smalltown (Apex is kinda smalltown still but growing at a rapid clip), you could look around and get a feel for where you want to go. If you buy a house right off, you'll have a better time selling in that area than in Johnston Co should you decide to move.