DELL is best company in LAPTOP. You can purchase DELL company's Laptop only which is best in the quality as well as in warranty period also. Most of the people go for this company.
I have to agree on this one. Apple is the best in personal computers right now both desktop and laptops. And before you start the mac vs pc war. Think if you perfer windows you can always use windows on mac. But from the brands you listed I voted for dell just because for the price you pay you get a good deal. But the best choice IMO would be apple.
Toshiba does make decent computers but i always have battery or fan problems in their laptops. If you dont go cheap with dell you can actually get a good computer.