Well you see the thing is, laptops weren't made for gaming.
Laptops are your quick and easy fix to do simple things online and do MILD gaming at the most, anything higher and the laptop will lose TWO of it's key features.
1. It will lose it's size, it will have to be big to accommodate all the necessary hardware. Bigger size ruins the point of a laptop, as you probably bought that laptop for an easy-to-carry thing to help you on the road.
2. IT'S WEIGHT! Think about it, that laptop will have to hold everything a desktop holds, now we have stopped talking about a lightweight machine, but more of a sophisticated powerful BRICK.
Sure there are lappys that you can buy for $2,200 that will bring some desktops to shame, but it has those two points listed above.
3. THE PRICE! Jesus $2,200 come on! Now you're probably thinking, heck it's worth it. Just think, you can get yourself a DESKTOP with the same, if not better, components, for $1,400-$1,500 TOPS!
Now I read your post of course, and you said mobility is important.
Let me bring up some more points.
1. You probably won't be gaming when you're moving, when you're on the go you aren't going to have time to join some online server and play for a couple hours.
2. Look at the price, you could either get a $2,200 lappy, or get a $1,400 desktop with $800 bucks to spare!!! Now you can't move around, BUT, with those $800 bucks you can buy yourself a laptop!
Now you can buy yourself a laptop that goes a little above minimum or even recommended specs for that game.
So while you are at home you can be gaming on maxed out graphics, enjoying your sexy beast, and when you are on the road and it's nighttime, and you have some time to play, you can pop in the game and tone the settings down a bit and have some fun.
Here is my suggestion to you my friend.
Build yourself a desktop for $1,400, hell, even a $900 desktop will KICK ASS. Now with the money you saved over you can get yourself a laptop that you will need in terms of mobility, but you can also play the game on toned down graphics.
So basically when at home, you can play on your desktop on Ultra High Graphics (Let's use flight sim as an example) you can fly where you want whenever etc. etc.
Now you have a business meeting, you take your laptop there, do what ya gotta do, and at the end of the day, when you are in a hotel for example, you can pop in flight simulator, tone down the graphics, and you're good!
Now personally I find that the better choice, but your call
EDIT: Another point, once you get a gaming laptop, it'll be just like a desktop, don't forget about battery.
That gamer will CHUG the juice out of that battery, you'll be dragging a power cord wherever you go, just one more point