Un-uniquenes. Why choose to be something in a fandom that's already been done over one-thousand times before? Use some creativity and come up with something new.
It's been done a thousand times because canids are just awesome like that. IMO, don't try and fix something that's not broken; if you like canids, then be a canid, no matter how many there are!
It kind of annoys me when people say, "No, don't be a fox or a cat; it's been overdone." Part of the fun of the fandom is picking your own fursona. It's like picking a name for a child. There are the celebrity names (
)...and then there are the rest of the names, popular or not. You just have to like the name.
If you want a unique fursona, then I say go for it!
But, if a fox feels right, then a fox it is!