I do not think we should get a running back. We are already deep with helu, burkhead, robinson (two freshmen). If we get another this year that would discourage Aaron Green or any other running back from coming in 2011. Now if a high quality running back like Gio would want to commit then you definitely can not deny him.
I think RB is a more pressing need than LB at this point.
No one has stepped it up behind the three guys you mentioned, and seeing as Helu has failed to stay healthy for a whole season the past 2 yrs. and not knowing how Burkhead is going to play after his injury, I think RB should be at the top of our board. I'm not saying we should turn away a good player if he plays Defense, like a LB or Safety. But we need to focus on Offense and try to get at least another WR and a RB.