Favored Quarters

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In Pittsburgh its mostly on the Northern side and Western side with a line extending int Butler, however both SW and NE have some high income areas. Only the Southern and SE Pittsburgh suburbs don't really have any favored areas.

Historically, the favored quarter in the South Hills was Upper St Clair (and to a lesser extent Mt. Lebanon) and later on Peters Township as an exurban favored quarter. But since the former two got filled up quickly because they are relatively small and got built out quickly, I'd say that the favored areas of the South Hills aside from USC/Mt Lebanon are largely areas with golf course neighborhoods or near them. 

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Inside the city of Pittsburgh, the favored quarter is Squirrel Hill, Shadyside, and the Strip District.

I'd say that Fox Chapel and Sewickley are "old money" suburbs of Pittsburgh, with Cranberry and Wexford being the "new money" suburbs of the North Hills.

In the South Hills, I'd say that Upper St Clair is the "old money" suburb if there is one in the South Hills and I would say that South Fayette, Peters, and parts of Canonsburg not near Peters but near golf courses are sort of the "new money" suburbs.