Looking for views on bi-amping

I have a pair of CJ prem 12 mono driving my large Proacs. While not really maxed out, I was wondering if there were any benefits to biamping the speakers other than pure power.

Does anyone have any views on what would be good match. I thought about picking up a CJ prem 11 (a two channel version of the 12's) and using it to run the highs.

I am running Naim and Linn sources through a CJ pre-amp for the front end.