I currently use a Asus G51, and it has lasted me for about 4 years now (still can play GRID2 apparently
lol)
A few things about these kinda laptops:
- They are heavy and bulky, travelling with them is quite annoying, so its more like a portable desktop. I find 15.6" big enough already, 17" is just massive.
- They may run hot (at least hotter than desktops and normal laptops) , you may need to get a cooler to keep temps down
Alienware is a good option with the warranty and stuff but there's other options you can consider.. the clevo barebones like AETAaAS mentioned, or the asus gaming laptops:
like the ASUS G750JW ROG (check amazon) for about 1.5k pounds.