Decent Chinese in lower Westchester?
Maybe a passable Sichuan, or Hunan, or Cantonese restaurant?
Is White Plains lower enough Westchester for you? If so, Aberdeen (in the lobby of the Marriott Residence Inn on Barker Avenue) is a very good choice for Cantonese.
Imperial Wok on Route 22 in North White Plains has a small Sichuan menu that I've gotten several good dishes off of. It also has a small Taiwanese menu that I haven't sampled yet, but others have said good things about.
If you're looking for roast meats, Kam Sen in the White Plains Mall is a decent option. The mall also has Bao's, which is mainly Chinese-American, but Chinese-American done better than your average takeout joint.