While there are tomato starts at every garden center, there are strong reasons to grow from seed:
1)Diseases are rampant in mass-produced tomato starts. The deadly late blight that swept the Atlantic seaboard a couple of years ago started with tomato plants from garden centers.
2)The types with the most flavor are seldom available from nurseries.
3)With seed, you can pick what will do best in your situation, not just what is nationally available.

Our varieties are all chosen for flavor. Each fills a different niche, and they are listed in order of ripening. I recommend growing an early, a main crop, and a late tomato to have a dependable supply all summer.  Sauce or paste tomatoes are less juicy, and make a thicker sauce, but all tomatoes can be used in cooking. I have noted which tomatoes do well in especially cool or hot climates.