My current presentation laptop is a 2-core machine with (maxed out) 4 GB of RAM. That’s fine for doing basic work, but was really getting long in the tooth and prevented me from doing more interesting scenarios, like having several virtual machines interacting at once.
As a result, I decided to upgrade. I ordered an Asus N550-JV-DB72T notebook. By default, this comes with a slow hard drive and 8 GB of RAM, but I ended up bumping that to 16 GB of RAM and a 250 GB solid state drive. At this point, my new laptop will be a bit more powerful than my current desktop machine, and will definitely allow me to do more complicated demos.
I might have a full review of the laptop after I receive it, but that won’t be for at least another week or so.
36 Chambers - The Legendary Journeys: Execution to the max! 
What OS? Did you get a good deal on it?
Windows 8.1 but I will install VMware Player immediately. As for a good deal, it ended up being a little under $1400. I might have been able to save a few extra bucks but I wanted something very high-end and didn’t feel like cracking the case open and modding it myself.