Do you need to work with all of the raw data from Google Earth in real-time? Or maybe your job requires you to run Autodesk 3ds Max, Adobe Premiere Pro CS5 and MASSIVE simultaneously while away from your desk. If so, I'd like you to refer to the recently updated Dell M6500. This boy will be available soon with 32GB of DDR3-1333MHz RAM.
At the time of writing this post, the option is not yet available to choose from, although it is listed under the product description. However, since the 16GB is $1,051, all the storage doesn't come cheap. Good thing this option is marketed to to work for either three letter government agencies or research companies supported with funding from SPECTER or the like.
Update: Dell just posted the price: $9,300 will get you a configuration with the 32GB option. The update should hit the customizer at 3pm EDT.
