LJ or LT or draft- that is the question?

with willie parker most likly gone after this year, wouldn't it seem likly tht the steelers would pick up a proven replacement back in case mendenhall goes down? to get larry johnson now he could grow with the team, to wait on LT might take some time, but to wait on a rookie could take three or more years, i feel with the other two there it might go a long way to stopping mendenhall's fumble problem.