JB, I can relate to your customers. We have been choosing and cutting our Christmas trees for 8 years, as long as my husband and I have been married. I can't imagine giving up the tradition.
Returning to the topic of the thread, I only have a few store bought tomatoes this year but my favorite from seed is 'Cour di bou'. I'm probably wrong on the spelling, I'll look it up later. It's a beautiful heart-shaped Italian heirloom. I just don't have much success with, or use for most other vegetables! One day when I have a homestead, I'll try again, but right now my yard is too small for anything but beautiful flowers!