Firstly I would like to suggest you based on your need. If you need to laptop for playing games. Choose one with good ram(4gb) and with a good graphic card(AMD or NVIDIA)
If you are student and need it for education purpose, 2gb ram is more tHan enough. and 500gb hard disk is enough. choose one with lighter weight and smaller size, it would be easy to carry.
If you are professional, concentrate on how effectient it is and then choose with a minimum if 4gb ram and 1tb harddisk.