I think you draft the best player avaiable and use free agency to fill holes in your roster. If you don't leave yourself some flexibility in the draft, then you risk passing on a potential great player to find a guy to fill a gap. I hate when teams do that. This is the Sam Bowie argument. If the Blazers had just taken the best player available, they would've had MJ. The same goes for any sport. You take the best guy out there.
Personally, I think we are set to pick Mendenhall but that is just a guess.