Bottom line, nothing out there scares me as a fan of UConn.
I think the top three of Zona, UConn and Purdue can beat each other on a neutral court when fully healthy. All three are good. I know Zona just lost to Purdue but that was not exactly a neutral court.
I think KU is a step below those three when healthy but may have the best coach of the bunch (by a hair) with Houston being a complete wildcard still.
I would go:
Purdue (resume speaks for itself)
KU (ahead of UConn based on their head to head win)
UConn (see above)
Zona (a step below on resume)
Houston (what is a resume?)
Right now.