I concur on the UPenn statement. From a close friend, I know they are top-notch, and regularly send their grads to the top Ph.D. programs (Penn, Stanford, Berkeley -- and those are just the past two years). For the SOP, I would suggest emphasizing that you know you lack the language skills (otherwise why else would you apply to the post-bac), but that you are hoping the post-bac will remedy that problem. I don't know about UCLA or Columbia (I think Georgetown and UNC also do post-bacs), but you can't go wrong with Penn.
