Well, when I look for a laptop, a 17.3 inch display is what I always go for (I often watch movies/TV shows on my laptop), the style, I won't by crap quality. I only by Toshiba, ASUS or SAMSUNG. My last 4 laptops where Toshiba, becuase they have been cheaper. I usuauly buy a new laptop every year, to keep up to date.
I try to buy at top of the line as I can, with what I can afford.
I also, check underneath, and see how easily accessable the HDD and RAM is. I had a couple where you have to remove the whole bottom panel, just to get to the RAM or HDD. I had two different HDD that I would switch, but I forget why. I always like if they are easily accessabe (a cover, apposed to the whole bottom).
I check the keyboard, and see if I like the feel of it. I also boot from Ubuntu CD, and see if everything works, and it has the drivers.
I usually pay around $700-$800. The one I have now, is kinda cheap. The mousepad buttons, don't work as well. When I goto left click, it would bring up the right click menu, also when typing on the keyboard, the letters don't always go through, which is annoying.It's a Toshiba Satellite L70D-A.
I couldnt afford a better one at the time.