I am putting in a variety. I like a roma as my wife will make salsa or can them we also like Cherry variety to put in salads and a larger tomato for sandwiches. Amazon has some seeds but id like to know where else to grab some also. im going to start ordering soon to start my garden plants and also want to grab the seeds for my greenhouseWelcome splinter67...
Anyway what do you want in a tomato flavor? Do you want a lot of tomatoes at once (sauce making) or fewer at a time but more spread over the entire season (fresh eating)? How big is your green house?
Look to the size of your greenhouse and how you can train them up wires or cords.
I like the deep flavor of the old purple and black tomatoes which also tend to be large indeterminate plant monsters. Cherokee Purple (big fruit 5-7" diameter), Black Krim (medium fruit 3-4" diameter), Chocolate Cherry (1" diameter fruit). And I like the tiny sweet grape type like Super Sweet 100s or Juliet. For roma(ish) Amish Paste or Wisconsin 55 worked very well but were both long adapted to southern Wisconsin / northern Illinois where I lived.