What tomato variety is the best tasting for home gardens?

I can remember when tomatoes tasted really sweet and had that nice ripe tomato smell. At the grocery, they are hard, cardboard tasting, pulpy, and with no tomato smell at all. No amount of ripening helps them either. I will be growing my own this summer, and I would like a recommendation as to the best-tasting, juicy, and sweet smelling variety. I know there are some kind of heirloom, but they are not always available in my area of PA. I prefer to start with seedlings rather than seeds which take to long here to get started.