I've just started a few early plants, but will start most of my tomatoes in a week. If I were only growing 4 they would be Big Boy (large, meaty, red), Brandy Boy (Burpee's Hybrid Brandywine) Yellow Bell (a wonderful paste/salad tomato from Southern Exposure seed exchange),and Sun Gold, a fruity orange cherry that I eat more of every summer than any other tomato, because I eat them off the vine while I garden.
I grow more than this (I'll list in comments), but I'm wondering what you're planning to grow. How many different varieties do you grow, how many plants, etc. I can't wait for the season to start!