Flat out best gaming laptop doesn't neccessarily mean the best video card. You have to look at the bigger picture and weight out everything.
Dell XPS is a great PC. It has a awesome video card and awesome pentium power. But you can't hide the fact it is also over 10lbs in weight. If you consider lugging around something over 10lbs a portable laptop, cool. More weight, err power to you

When looking at the best you have to look at processing power first. No matter how powerful your video card is, if the processing power is not there to handle it, it is useless. Then you you look at everything else, such as video card and RAM.
Since the keyword in here is laptop, i would consider anything under 7.5lbs a laptop. Anything more than it, I would consider a mini-pc
Keep in mine, bigger, heavier, larger = more heat, more weight, more ackward to move around with, more power consumption
You have to admin the Acer Ferrari 3400 is the best in the class.
1) It has a great weight to consider it being a "LAPTOP"
2) It has low power consumption, thus mean less heat
3) It has a decide ATI 9700 128MB card, in which case could knock on Doom 3 and UT2004 without any problem
4) It is using AMD64, meaning it is upgradable in OS to meet future demand
5) It is around 2k in price
Don't forget time and time again, in gaming AMD64 kick ass! over Pentium Processors
Weight out all the factors, the Acer 3400 is the best in the class in terms of power vs price vs weight ratio.
Yes the Dell XPS got better processor and it got better video card, but I wouldn't consider it a laptop period.
