Best what? Best Restaurant? Best Nightlife? Best School District? Best View? Best Main Street Neighborhood?
You name the category...I'll give you some "Best"s
Another good thing to do is to check out Pittsburgh City Paper's "Best of" Issue also on line
I will give you a few favorites. I like Mt. Lebanon for great schools and public safety. It is close to everything and kept very clean. It has a neat main street with lots of shops and restaurants. For a quieter more breathing room type of area, try Jefferson Hills, good schools. Lower taxes to the South in washington County, North Strabane and Peters Twp. are both nice with great schools and public safety. Check my site for more ideas.