That whole area is quite nice, and reasonable far as I can see, for the most part.
Just to clarify what do you mean by "upper class"? Are you looking for a particular "type" of people, or just nice houses? Or are you looking for a McMansion development? There are tons of all of the above.
There are lots of classy people who live in tiny little houses or mobile homes.
And there's tons of filthy white trash who happen to have the money to buy a mcmansion on a hill, and keep their nose in the air.
There are some very exclusive housing developments going up (gated communities, etc.) all over the area, (I for one have no interest in that kind of "class"--I want to live IN Tennessee, not have a gate to keep Tennessee out!

)
There's tons of stuff here for everybody, but in my opinion, it's important to keep in mind it's ALL TENNESSEE so I wouldn't expect to be able to find Beverly Hills here.
Good luck!