Brown is more or less leaving United since his contract is
almost up and haven't feature as much this season because of the
bust up with Fergie earlier in the season.
O'Shea is more of utilityman and he's super slow, which explains
why he's always thrown on the left and right back slot or centre of
the field where speed is not a necessity.
Pepe could be a good signing:
1. Rio is near retirement age and getting more
injury-proned.
2. Evans is super shaky
3. Should Rio and Brown be out, Vidic is the only experienced
centre back.
Anyway, I think the Ritchie De Laet guy could be useful. Last
season's reserve player of the year can play all across the back 4
and he did alright for Preston, starting in all matches but alas,
he got recalled because of Fergie Jnr's sacking. 
wasn't too impressed with this RDL's guy when he is playing.
brown is confirmed out, evans is having a confidence crisis.
Rio is slowly becoming in the company of scholes/Giggs.