Sheed would be an interesting fit for OKC. They need a good big man and a veteran leader. Sheed is a good big man - that's obvious. I would be really curious to see if he has it in him to become a leader for that team. His career thus far has said 'no', but I've seen stranger transformations in this league. Never would have thought Starbury would be hesitant to shoot, would you? Or that Artest would be a class act for an entire year... anywhere? Or that Melo would play defense and team basketball? You get my point. If Rasheed Wallace decided to take that team over, they could surprise a lot of people over the next two years or so. Somebody would have to teach Durant to play some defense, but they could score with anybody.
It's pretty unlikely OKC brings in Sheed. They have Durant and Green starting and playing 35+ mins at the SF and PF. They brought in Nenad Kristic to be their starting center as well (people forget he's only 25) and his minutes will increase from the 25mpg he played last season and they already have Nick Collison as their backup PF-C for the next 2 season at $6mil+.
That said, they have 11 players with guaranteed contracts going into next season with their total salaries coming in around $41mil. So they have the money to spend, but I'd see them focusing on bringing in a SG to help Durant and Green with scoring, as apposed to another PF-C. I don't think the platoon of Thabo, Damien Wilkins and Watson exactly blew them away at the SG position this season. Watson is more suited to playing the backup PG position, but was forced to play minutes at he 2 once they went with Westbrook at he 1. Thabo brings some defensive toughenss (and his stats did improve across the board in OKC), but again he seems bettered suited in the "defender off the bench role". And I just don't know what they thought they had in Wilkins when he was playing.
They do need size and a low post presence, but Sheed doesn't give them either of these, and their need for a competent SG in the starting lineup leads me to believe that is where they will spend the money. Unless they want to cut into Kritic and Green's minutes, or pay two backup PF-C's $15mil per season total (signing sheed and paying Collison) it doesn't seem to make sense.