Definitely agree -- X20 and Restaurant X are great - a real top-notch experience - you can never go wrong with a Peter Kelly place! Atrium Restaurant at Doral Arrowwood in Rye Brook serves a good Sunday brunch too. Also - Sunset Cove in Tarrytown.
238 Green Street, Tarrytown, NY 10591
re: Sra. Swanky
Also, shoekittykat, if you're willing to travel to SoNo in CT, the Brewhouse has an excellent breakfast buffet. The desserts aren't that wonderful, but the lobster pot pie and the raw bar are top notch items. Omelettes are ordered at table. With unlimited mimosas and a price of $26.95, it ain't a Kelly place, but it ain't bad.