I need to order a new model kit for general chem and my (much smaller) inorganic chemistry course.  Every spring when both courses roll around to optical and geometric isomers of inorganic coordination compounds, I am frustrated and flummoxed about how to best demonstrate them.  Particularly difficult are the chelating ligands.

I use the framework molecular model set by Prentice Hall in my Inorganic class. 

I am about to put in my "book" order for the fall and I was wondering if anyone has found a better model set to use in Inorganic chemistry?  This set has trigonal pyramid and octahedral geometries. 

Kurt