Which of the following is the best price for dell's 1501 m and 640 m?

Buying a notebook of my own is my first goal. after collecting data from various parties, and considering that he is a limited company, he finally locked the DELL notebook. good for IBM and HP, but the configuration of the same file is much more expensive than that of Dell, and I am talking about JS exploitation on the Internet, I am a little bit of a computer hardware, I cannot afford to go to the computer city in our small place to fight with people. Moreover, the most important thing is that I am afraid of trouble ~~~~~. It is still easy to direct online sales, beat the money, and send the goods. However, I heard that some sales representatives have to be found, and the Dell screen is normal within three bad points, it's horrible. why is it so troublesome to buy a notebook? I want to buy a notebook instead of changing my desktop. now that you have decided to buy a Dell instance, there will be no model issues.
1501: The price is low, but the screen size is big and heavy. It is not suitable for girls.
640 m : A cpu cost is less than 1500, but the core dual-core U is better than AMD, and the screen is small.

Which one should I buy? Will the price be reduced recently?