As with the others, visit you local farmers market. It's still early to get fresh tomatoes, even the local stuff is still likely green house grown.
We've grown lots of varieties, my wife got on a heritage kick a few years ago. They all tasted good, but the plants don't yield as much and can be kinda finicky to keep happy. The hybrids at the box stores are lower maintenance.
Seedlings can be hit or miss with the heritage. Too late to start seeds unless you can grow them indoors.
Cherokee purple was one of the better choices. They can get really big but are prone to split.
Amish paste are good if you want to make sauce and can it, similar to Roma.
Cherry tomatoes are really tasty and very prolific. A couple plants makes lots of tomatoes.
Mr Stripey and Brandywine were good. Others we've tried.... Black Krim, Mortgage Lifter, Abe Lincoln, Homestead, German pink/yellow, German chocolate, ... there's lots.