Rpck Hall is probably the most central location with approx 1+hr drive from the Newark area. Many marinas in Rock Hall keeping the prices 'competitive'.
Haven Harbor Marina is nice but dont expect to do any DIY work, yard work seems to be extravagantly overpriced. Sailing Emporium is our 'favorite' in RH.
Worton Creek - 3 marinas (Worton Creek Marina will 'chintz' & nickel and dime you to death - unexplained/unforseen labor rates can be more than 'extraordinary'), Handy's Point is probably one of the 'best values' on the northern bay;
Tolchester Beach - expect pricing conflicts for work done - lots of '$ padded-on stuff', and has the history of the 'epitome of a totally dishonest marina';
Sassafras River - 4 mile 'slog' back and forth to the bay .... lots of 'rude' powerboat wakes on the Sass.