Weekend Brunch/Lunch Woodland Hills/Encino/Sherman Oaks
I'm not sure what you are looking for in terms of price and cuisine, but there are several options in Sherman Oaks -- Hugo's, La Frite, and Cafe Bizou are all good options. I also like Marmalade's brunch.
I think a couple of the Indian restaurants in Encino and Tarzana have champagne brunches. I know Taj Mahal in Encino is supposed to have a good-sized brunch buffet.