Tough question, really! There's so much more out there than what I've gotten around to trying. And it's so hard to narrow it down on some things, but here's a few of my favorites:
Tomatoes -- Delicious and Black Krim (both OP)
Peppers -- Giant Red Marconi (sweet), Hungarian Hot Wax Banana, and Mucho Nacho hybrid jalapeno
Summer Squash -- Pic N' Pic hybrid, very prolific and more resistant to powdery mildew
Winter Squash -- Waltham Butternut (prolific, good keeper), Jumbo Pink Banana (super sweet for pies)
Cukes -- Muncher hybrid (slicer), County Fair hybrid (pickler)
Corn -- Delectable (se) hybrid
Eggplant -- Fairy Tale hybrid
Etc. -- Russian Kale, Bright Lights Swiss Chard, Sugar Snap peas, Purple Plum radish
Cantaloupe -- Athena hybrid
Watermelon -- Crimson Sweet, large, tasty and very dependable for me
Beans -- Nickel (OP/heirloom pole bean), haven't really decided my favorite bush variety yet
Onions and Potatoes...I just get what is common to my area at the feed store
Lettuce -- I usually grow Black Seeded Simpson or a loose leaf mix, but there's a whole world of lettuce out there to explore!
Things like spinach and carrots, I've tried a couple, but have never been particularly successful with any of those anyway...
I agree on the Detroit Dark Red beets, Lavender...they are just so good, I've not been tempted to try anything else.
As much as I like certain things and as fun as it is to try new ones, something that performs well for me in my area might not work out as well for you.
So many varieties, so little garden space!
