The guy I'd most like to see here is LaMarcus Aldridge, but to be honest I think that's a real long shot.
My second tier of options would probably be Greg Monroe, Jimmy Butler and Nerlens Noel (via trade). I think Butler is pretty unlikely, but I think Monroe and Noel might be reasonably achievable.
Third Tier is probably DeAndre Jordan. Not because i don't value his skill set, just because I don't think this team is a good fit for him. He's completely incapable of creating offense, so he needs to play on a team that's filled with high level scorers, and a team that has a great PG to deliver him the ball - we have neither. I think Noel is better suited to us because he's just as good as Jordan defensively, but he'd be far cheaper to acquire and has more offensive upside.