In respect to keeping current guys, I'd love it if he kept Ash. Not only is Ash a great coach, he's done a lot of recruiting for ISU as well. I think he would be the perfect "hold-over", if Ash even wants to hang around.
About Chizik hiring some Texas assistants, I heard on KXNO that a certain person informed them part of his "deal" with Texas was he couldn't hire any of their coaches. KXNO then speculated from this information, that they hoped being that was part of the deal, hopefully the other side was he no longer has a commitment to Texas - meaning he starts at ISU now and will not need to be with Texas for the bowl game.
The first part of this seemed to be proved wrong, as when asked about Texas assistants, Chizik said there are some guys down there he's interested in.
I've heard nothing so far about the speculation of Chizik no longer having a commitment with Texas.