I'd forgot about Kelly, and that he'd played the CB role for England U21. To be honest I'd put him ahead of Wisdom as he has a coolness on the ball, and while Wisdom seems handy in the air, Kelly's extra height has to be taken into consideration.
My preference is to have 3 CBs at or near their prime available and if Skrtel goes we'll have to spend some serious money, but personally I hope he stays. Otherwise we could end up spending most of our transfer budget on 2 CBs.
Another name I mentioned on another thread by might have got lost with this new format is Scott Dann. I know we were in for him a couple years ago, and while he may not be the top draw we are after, I think we could get him for under 10M, he's young enough to meet the FSG profile, but experienced enough to have an impact, and as a local boy could provide that leadership intangible we'll lose when Cara hangs up the boots.