The tomato guy known as the "North Carolina tomato man", Craig LeHoullier recommends in his book Epic Tomatoes : How to Select and Grow the Best Varieties of All Time. I live in California and I can say the my Sun Gold does GREAT, year after year. These were his choices
Nepal
Yellow Oxheart
Polish
Green Giant
Sun Gold
Lucky Cross
Lillian's Yellow Heirloom
Pink Brandywine
Cherokee Purple
Mexico Midget
There is a great article by Virginia A. Smith, Tribune News Service, called Spreading the word on the pleasure of heirloom tomatoes and Craig LeHoullier.
Hope this helps
Sequoia in California
