musicdiver

Welcome! And USA is a good starting point but if you narrow it down to state or region within a state, that'll help even more! it would also help to know what your budget is and how hilly the area you live in is (might change whether a heavy Dutch bike or British 3-speed is better or something with more gears).

I second Big Block's suggestion to peruse LovelyBicycle.
Here are a few of her entries that might be particularly useful for you: Lovely Bicycle!: Lovely Bicycles on a Budget: Vintage vs Modern (vintage vs modern)
Lovely Bicycle!: Choosing a Transportation Bicycle? Some Ideas to Consider (things to consider when buying a bike)

And reviews of specific bikes, such as the Pashley Princess - Lovely Bicycle!: The Pashley Princess: a Retrospective from a Former Owner
The Papillionaire Sommer - Lovely Bicycle!: Fluttering About: the Papillionaire Sommer
The Bobbin Bramble - Lovely Bicycle!: A Go on the Bobbin Bramble

and the true vintage option, a Raleigh Lady's Sports - Lovely Bicycle!: Review of "Lucy 3-Speed": a Raleigh Lady's Sports