Gosh, this is such a difficult question for me!
I've never owned anything besides Labrador Retrievers. I love them to death, but they are so common, but for a good reason, they are excellent family dogs, and for the most part, have wonderful friendly, goofy temperaments! I think all Labs have a somewhat different personalities, Sadie and Rita are nothing alike, LOL!

I could definitely see myself owning a larger breed, like a Rottweiler. I could also see myself with a Soft Coated Wheaton Terrier, my neighbor has a Wheaton girl (Maggie) and she's so full of life! Wheaton's are very high energy dogs, and need constant exercise! Well, they are Terriers!
I have also found myself to be very fond of Pugs. They have numerous health problems, this breed is basically a mess health wise. They are great little dogs, and I love the fact that they think they are huge. They have such spunky personalities, and I love that in a dog.

Other than that, I'm not completely sure on which breed I will own next, lol!