I used Diersch Florist for my wedding in October. I got bouquets for the bride (myself), bridal party, boutonnieres for the groomsmen, and flowers for the parents and grandparents, and flowers for the church. We did not do flower centerpieces...
The staff at Diersch did a flawless job. We met twice before the wedding, I brought them pictures of my ideal flowers and they went above and beyond what I had brought and what I had expected.
We had the flowers delivered to different locations and everything arrived on time. They're prices are very reasonable. I would definitely recommend them to others planning a wedding in the area.