do you mean a workstation for GIS software?
I give and example for ArcGIS,, ESRI make some cooperation with hardware vendors, and maybe you can take some example on their page here :
http://www.esri.com/partners/apps/hw_promo/index.cfm?fa=search&qry=getDesktop
pick desktop and workstation as an input query, and you may find some workstation and laptop offer,
regards,