As cwsox said, Joe Crede will be fine. He's our 3b and I believe he will stay our 3b.
As of right now, platooning ARow and Timo seems like the best solution in CF. I'd look to see Joe Borchard continue his recent upswing in AAA for awhile before we give him the job. I'd still leave Reed down there to get more seasoning.
I agree that Harris should play 2B at least 80% of the time. An occasional foray into CF for the sake of a productive matchup wouldn't be out of the question. With Uribe's ability to play 2B, SS and 3B along with Harris playing 2B and CF, there is no reason why Uribe, Harris, Valentin and Crede could not each play in 75 to 80 percent of the games. And Uribe really is thriving in this utility role, so I wouldn't change a thing with they way they are using him.