Ogbonna is a pipe dream. Both Milan clubs are apparently going to put in a bid in January, Napoli are interested, and Juventus would be too if Og wasn't a Torino player. Every big club in Italy wants him, as well as some foreign big clubs (United, for example). I can guarantee he will not sign for Saints. Given that he has 4 years left on his contract as well it's going to take a hefty bid for Torino to sell in January. I think he'll go to Milan, personally.
And I agree with all the comments re Upson, Davies and Dann. All rubbish/average players who wouldn't displace our current CB pairing. Upson and Davies especially are woeful.