He will be within the range of all three of the Spurs first round picks, I suspect. He can shoot, and he's tall. Anybody remember Steve Novak? He could shoot, and he was tall. Novak he was 6'10" and only a slightly better rebounder PER36 than Tony Parker. Nowhere near as good as Manu. If he can get NBA teams to give him a $21M career like Novak did, good on him. Just not here.
The biggest difference between Novak and Manek is that Novak didn't look like the GEICO neanderthal. I couldn't stand looking at him for an entire season. I would take Fathead back in a heartbeat, and not even have to use up a draft pick to do it.
I now Manek looked okay in the NCAA. But remember that most of the really good college players are gone after their second year. Manek was a fifth year player, and... oh none of that matters. Just don't make me look at him for an entire season.