Just another thought with the more power hungry Laptops. When it comes to mobile power, my own requires 120Watts and I have not been able to find a sleek and sexy car charger capable of handling it yet. I have to use an inverter, which means fishing out the power supply and lead, then plugging the whole shebang into the 13 amp socket on the inverter.
It all means increased weight and as a consequence, real life portability will suffer to some extent.
Conan