I'd have to say it's a tie between Labradors and German Shepherds right now. I've always adored GSD's and ever since getting to know the breed, they are just one of my all around favorite dogs. Enzo is what made me love Labradors, and I think that I'll probably always have one of these goofy happy dogs around.
Runners up are JRTs and Australian Shepherds. Along with Border Collies and Collies. I love all these breeds, and I'll probably have one of each at least once, but I can't say for certain that I'll ALWAYS have one of them around.
Breeds I love but will never own? Probably pit bulls, Golden Retrievers, Boxers, and Dobermans. I love pitties, but I can't seem my lifestyle ever accommodating another DA dog. Ozzy is so much to handle, and while I LOVE the HECK out of this dog, I can't say I love his hardheadedness in regards to other dogs. I wish I could take him more places, do more things with him, etc, but his DA doesn't allow for that, because he fights to win, and he pokes holes in other dogs. People frown on that.
Goldens are airheads. Not saying Labs aren't, but I've never met a Golden that I wanted to take home with me.
Boxers, well, I adore my brothers Boxer, but I won't own a brachyphiliac (I know I didn't spell that right, but spellcheck isn't helping me at all) breed on principal.
Dobes, I like them a lot. Steven adores them, but meh, I cant see myself with one, unless Steven does the research and gets the dog. And then it'll be his dog anyway