I've used Poppy, with flat armor yellow, blue, and quints, with AD reds. Spec'ed into the defensive tree for as much physical damage reduction as possible, with my remaining points in the offensive tree.
She is actually incredibly effective against Rengar when she obtains her philostone. Although she won't dominate or destroy this lane, she can definitely hold her ground and still get farm against him in lane.
I've done this physical damage reduction on Jarvan and Garen, They still don't win lane, but they definitely don't lose out either.