Asus is great, 2 year warranty, 1 year of accidental damage protection included is amazingly great.
Sager however makes one heck of a notebook, very tough units and some of the best as far as gaming notebooks. For standard use however, asus is great.
We've visited their warranty and if I recall we found out that is not really the case, and they don't cover abuse. Accidental damage seems, very gray in their warranty agreement. There is a whole thread about it, but I don't have time to sift through the threads with the search feature.
I've been in IT for 10 years now, 5 of which were spent mainly as hardware repair and end user support. During that time, I serviced every major company, every brand of laptop, and a very broad range of users. I've also owned a laptop from every major company as well.
My opinion is very biased as I am not an average user and I have taken apart and repaired pretty much every laptop under the sun. I don't really do many hardware repairs today, but I am pretty sure I could still very well easily do it. It is like riding a bike in some aspects.
I think the best laptop made, is the Macbook Pro. I have many reasons for this, and could go on and on about it. It is light weight and slim for how powerful it is, and it can run any software and any OS. This gives me the most flexibility and mobility out of one single device.
Now, if I were to buy a PC laptop I would buy the following:
Lenovo
Asus
HP Business class (not consumer models)
I would stay away from everything else. I think that Sony makes a decent laptop but I used to service them, and getting parts from Sony is a huge pain and dealing with them on the warranty side was also a nightmare. Their company in those regards suck big time. Dell makes crap, that is just my opinion and you aren't going to change it. HP/Compaq consumer stuff is cheaply made, and you can get a good deal but you are getting what you pay for. Acers are the same thing. I feel that they are a good deal but I also feel that their qualify is not as high as the three I mentioned above.
Alienware and Sager I think are a joke. They don't perform all that much better than any other laptop and they cost sometimes over double. What does a 6 second boot time really get you over say a 12 to 15 second? Also, look at the power requirements and battery life on those. They are hardly mobile machines. I think if you want a gaming rig, build a desktop. If you want a portable one, build a barebones shuttle gaming rig.
All of my Apple laptops over the years (I've had about 5 different ones now) have in general performed better than any Windows laptop I have had. When I had my HP business class laptop and desktop (at a previous job, we had 10,000 PCs to support) I ran Linux on them strictly, and they were fast and responsive and very solid. I had an Asus for a short while which I liked a lot, but I sold it to buy something else which I can't recall at this time. At my job now we also have a few Dell and Lenovo laptops floating around and I do like the Lenovo ones. They are solid machines.
When I said earlier that my opinion is extremely biased, it is, and it is because I think a laptop is meant for mobility, not for gaming, or any other ridiculous configuration that some of the expensive laptops use.