I want to buy notebook,asks everybody to give me an option?

If you are looking for just the cheapest laptop, with a reasonable life span, go for acer. I use compaq, so hp is what i use, and I never personally encountered any problem in the last 2 years almost that I am using it. So I would say this is very good option. If you can afford Dell, then I think that is the best in most aspects, but check out if there is a service centre near by, since they are very few. And finally, DON'T consider Lenovo. My friends have it and it is giving so many problems that they are now using a desktop instead!