As anyone who's been around here for a while knows, I make a LOT of soup! (Or, at least, I used to.)
I don't care much for meat of any type in soup (except perhaps in very limited quantities) but do prefer chicken stock to vegetable broth - but that's a very small accommodation for making soup vegetarian!
How is everyone on mushrooms? I absolutely love mushroom chowder, esp if you have access to a variety of interesting mushrooms. I'll post that one just in case you have any interest. Since you say dairy is OK, Moosewood's Very Creamy Vegetable Chowder is a huge crowd-pleaser with vegetarians and omnivores alike. I also created a vegetarian version of Joe's Lasagne Soup that was much beloved by a coworker who grew up on vegetarian Indian cooking at home, and all-American fare at school. He called it the best soup he'd ever had.
Oh, and another is Mexican lentil soup from one of the Greens cookbooks. I'm not mad about lentils, but that soup has layer upon layer of flavor.
Got to run and finish something for work, but I'll post those recipes and hope one is helpful!
Happiness is not a goal, it is a byproduct. - Eleanor Roosevelt