Moved from main PPRO forum to the Hardware sub-forum.
Buy a Desktop Video Editing PC http://www.adkvideoediting.com/
-ADK Kudos http://forums.adobe.com/thread/877201
Build a Desktop Video Editing PC
-3 price level ideas in http://www.pacifier.com/~jtsmith/ADOBE.HTM
-what PC to build http://forums.adobe.com/thread/947698
-2 how to build videos http://forums.adobe.com/thread/1104182
-another video http://forums.adobe.com/thread/1145366
-another video http://forums.adobe.com/thread/1132363
-planning & Building http://ppbm7.com/index.php/intro-part-1
-memory for LGA2011 http://forums.adobe.com/thread/1098759
-an Adobe FAQ http://forums.adobe.com/thread/878520
-several more links http://forums.adobe.com/thread/815798
-build tuning http://ppbm7.com/index.php/final-results
Laptop Video Editing PC
When looking online, I've seen the Dell M3800 portable workstation as well as the Mac Book Pro 15". Both seem comparable, however, the M3800 maxes at 8GB Memory while the Mac Book Pro goes up to 16.
Dell is on the expensive side as it's a "workstation class" laptop with "professional" graphics (NVidia Quadro), enterprise class warranty and support, etc. Really well made, on a par with MBPs.
You can find consumer models from Toshiba, HP and some others, in the $1K - $1.5K range, with 16GB RAM and decent GeForce graphics chips that would just as well, perhaps a notch down in build and materials quality and support - but with similar or better performance.
I really like M3800 though, if only on paper - haven't yet put my hands on one. The $2249 model with QHD+ touch screen, Quadro K1100m, 16GB RAM and 256GB SSD - seems like a great system.
Hope this helps.
. For example, I've heard the NVIDIA card in the M3800 would be better in terms of rendering times/speeds.
The K1100m Quadro would be much slower at the Adobe MPE GPU encoding than many less expensive GTX mobile processors. It only has 384 CUDA cores and a memory bandwidth of 44 GB/second (the major two factors in nVidia processors for good GPU MPE acceleration). For instance a GTX 760m has 768 CUDA cores and 64 GB/second memory speed.
You might want to look a so-called "gaming" laptops that would potentially provide faster Premiere processing and many offer second and even third hard disk or SSD options, plus if you are using Premiere CC (version 7+) you can even in some systems get a second GPU. .
If I were to be buying a new laptop for Adobe Premiere it definitely would come out of the gaming category.