People who could beat Bisping

So pretty much the title here says it all...What I am asking is how many middleweights do you think could definitively beat Bisping?

After voting, feel free to comment specifically, which fighters you think could beat Bisping, why, etc.

Also I figured to make it a little more enjoyable and threw the "all in" option as a choice, so lets get some people angry here : )

Without further ado...