We keep our boat at Herrington Harbor North (https://www.herringtonharbour.com/north/)  They also operate another marina just 1 mile south (https://www.herringtonharbour.com/south/)  They are about 20 miles south of Annapolis.  Neither is cheap but both are very nice and very well run.  North has a West Marine onsite and a great hardware store a mile away. 
  
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Mark McGovern
SM #440 Cara
Deale, MD USA