I suspect that I won't be the only person on this thread to query why the hell you want to buy a laptop from the store that most people here totally detest (because of their incredibly poor service and staff that know everything about their commission and nothing about their products!)
However, even if we put that aside for the moment, it's still impossible to answer your question unless we know what you plan to do with your laptop. A laptop that's perfect for web-browsing, emailing, word-processing, etc might well be rubbish for playing the latest video games on or for high-end video-processing.
If you only want to store documents and emails on your laptop, you'll only need a small hard drive (or SSD or eMMC memory). However if you want to pack it full of videos, you'll need a really big drive.
If you'll mainly be using your laptop with the power adapter plugged into the mains, battery life might not be important to you but if you want (say) to use it for collecting data from people you're interviewing in the street, then you'll need really long battery life.
Similarly, if you'll mainly be using your laptop in your home, its weight might not matter much to you. Howeve if you'll have to carry it around with you all day, you'll need something light.
Tell us your requirements and we will hopefully be able to suggest a suitable laptop for you (and also possibly a far better place to buy from!)