Don't know if this counts, but Beaucerons. They used to be right behind German Shepherds on my list of favorites, but hearing more from those who have actually owned them and worked with them extensively, I'm a little doubtful. It may not be so much the breed as it is the breeders, but I'm realizing that what the breed is
ideally is one thing, but what many examples of the breed actually are is an entirely different matter.
I would still like to own a Beauceron, once I have done more research and gained more experience, but that probably will not be for 30+ more years (as I do not see myself owning more than 2 dogs at once). I used to be adamant that they would be the breed after Dog #2. They remain one of my favorite breeds, but now I'm not as inclined to own one so immediately.
Before I had Trent, I wanted a Doberman Pinscher, a Rottweiler, and (get ready for this!) a wolfdog
The wolfdog part should be self explanatory. I wanted one for the same reasons any uneducated kid would want one, but enough of my brain was functioning for me to do a Google search and realize they were too much for a first time owner.
Doberman Pinschers are trickier because I can't quite pinpoint what it is about the breed that's lost my interest. I still find them stunning, I admire Sizzledog, Toller_08, and PatchworkRobot's dogs and can't get enough of them, and I've actually enjoyed all the Doberman Pinschers I've met in person. It's probably one of those cases where it just didn't click, and nothing particularly stood out. That, and the velcro dog aspect and the infamous Doberman Nose Pokes. I like a dog that keeps to himself well, even when I am around. I really, really like my space.