If Danny is right -- and I think he is -- the most important player needed is a defensive stud/rim protector, and other than Embiid the best long term choice is Vonleh at No.5. Remember he's only 18 and may still be growing. You can trade for that guy too, but I don't like the choices out there that may be realistically available via that route, including Asik, who in my mind just not a dynamic/athletic enough player, and we probably have to give up too much to get him anyway.
At 17, I' want a 6'5-6'8 SG/SF who can get into the paint, has a very good perimeter shot and has can guard big SGs. There are several potential guys that could fill that position including Harris, Stuaskis, and PJ Hairston. I, like others, would move up to get this guy, trading at least one of our down-the- road 1sts to get him.