Julie, welcome to TE and all us wonderful Mid-Atlantic chics!
I know I'm going to beat a dead horse here but I highly recommend Proteus too. I bought my first bike last year, a hybrid, from Performance here in VA and sold it to Zen (another Mid-Atlantic TE'er) when I discovered it was too small for me. I then went back to Proteus (that's where I found out my bike was too small for me) and got my new bike which I feel is so perfect for me. I'd probably check Capitol Hill and City Bikes. I had a hard time finding like THE shop for me and Proteus is kinda far for me and I make the haul there because I feel it is worth it. :D

