Starlight --
We grew Bulls Heart in 2008. It was large but not a Fair winner. Nice tomato, meaty, sweet, but not a lunker.
Last year we grew Cleota's Pink which gave us some monsters even though the season was so cool here. It's sweeter rather than tangy, meaty, and was the favorite of both my mother and a friend. Original seed was from TN, I believe, so maybe it would be happy where you are, too!
Our Kelloggs Breakfast tomatoes were huge last year, too. 'Course we weren't going for a 7lb tomato, but they were PLENTY big enough. They would dwarf your bread unless you cut one of those round loaves in half around its equator or something. Then it might just fit. LOL