Here is a list of bikes that I might look at. I wouldn't exclude the step-through bikes. They can be good bikes for anybody.
Vintage steel can be good. No doubt a slightly different list would catch the eyes of someone else.

Thrift stores can also be a good place to browse, especially if you're willing to do some work on your bike.

2010 GIANT SEEK 2 Lg REDUCED - $450
Giant Escape City commuter bike w/ accessories - $225
Schwinn city 7 - $100 (carrollton)
Cannondale Quick 3 Bicycle (Fitness, City, Commuter,) - $500 (Emory)
Huffy Main Street Lexington Mens 700c Cruiser Bike - $175 (Norcross)
Vintage Schwinn Suburban Bike - $125 (Gwinnett)
1973 Schwinn Suburban 10 speed - $60 (Woodstock)
Vintage schwinn world tourist men's bike - $200 (marietta)
REDUCED vintage 10-speed Schwinn bike - $75
RALEIGH SPORT (Vintage Bicycle) - $185 (McDonough) (3 speed)
Ted Williams Sears Bicycle - $55 (Peachtree City)