I would recommend you try out the new MFP products from HP. For example, the following models:
M525 - Small work team monochrome MFP
M575 - Small work team color MFP
M725 - Workgroup monochrome MFP with A3/Ledger
M775 - Workgroup color MFP with A3/Ledger
These newer devices all share a new, larger, color control panel with much better touch. I think their response is probably what you are looking for.
All these devices were introduced at least 6 months ago, so they should be readily available.
Mike