You can still get the older Quickpanels from a GE Fanuc distributor (since GE purchased TCP), but they have priced them through the roof, in an attempt to encourage upgrading to the new 'Quickpanel View' CE based touchscreens.  They are about 1/2 the cost, and have a lot more features.  There is even a conversion feature in GE's Proficy Machine Edition software that lets you convert a 'QuickDesigner' .prj file into a new CE-based project, without having to re-create any screens, variables, or addressing.  Your best bet in upgrading the model you listed would be the 6" mono.