I LOVE Nadia Salon! I stumbled upon Nadia with it being on Walnut Street, and two blocks away from my home at the time. It's relatively expensive but you definitely pay for what you get - that being: excellent service, voluptuous perfected hair color and cut.
I highly recommend Lee for your Balayge and Ombre needs! I have naturally very dark Asian-brown hair. I now have a very soft and very blonde ombe with balayge. I never would have gone so light if it weren't for Lee's expertise. Also he's a wizard with a round brush and a blowdryer! After the best hair color and specific haircut, he'll wand my hair using solely a round brush and dryer and it is AWESOME. I've since moved away, but when visiting friends in Pittsburgh you can guarantee I have Lee do my hair.