What we really need to draft is a guy (whatever the position) who has the ability to be a legitimate #1 option on a championship worthy team... Admittedly that's proved, IMO, by the doing. We have a several guys who are good enough to be starters on a championship team (again, IMO : Keldon, White, DJ, maybe Vassel, maybe Samanic, maybe even Tre Jones & Lonnie *). But if we are going to compete, we need that guy. IMO, it's not Demar nor are we going to get said guy through FA/Trade. That leaves the draft, and IMO pushes us towards picking high potential, even if there is more risk...
So, Best Potential Available, regardless of position.
*Note that Poeltl isn't on this list - he is currently fatally flawed. It's not that he has to score a specified amount (KobesAchilles), but he has to be able to shoot at least 60% on FT's, and punish a team that puts a small (=<6'8") on him; he hasn't demonstrated either of those and he's in year 5 in the NBA.