Hi, We just re-did our kitchen it is about the same size as yours in the main prep area and also have 6' of 12" deep bases and 4 15" drawers along a side wall.
We priced I guess it would be semi-custom through Lowes and Menards (DIamond and something else both the top end of their lines). We ended up with custom and it was 35% LESS than either of the above. We got all wood boxes and drawers, Shaker style cherry with slide out shelves and 28 drawer boxes and several bells and whistles. They are beautiful in addition to being heavy and solidly constructed. The price the cabinet maker gave us included full installation as well. Custom is definitely worth looking into.

I Googled Amish Kithen and my state's name and found some prices. I called a few of the to confirm the prices were still accurate. They were lower than an online vendor.