Pls suggest a latop deal within 25K

I need to buy a laptop for daily use like email, browsing, multimedia (not HD content) and light gaming.

So, dosts somebody pls suggest a laptop deal.

Core i3, 4Gb RAM, 500GB HDD, 15.6 inch screen is preferred.

Also, pls. suggest will there be any perceptible difference between AMD Quad core and Intel core i3 for my above mentioned works? AMD quad cores are cheaper than i3.

Also, I have a Samsung Pentium dual core laptop (4 years old) 15.6" screen, 3 gb RAM , 250GB HDD. Everything is working good except the backspace key and webcam.

Snapdeal has a buyback offer where they are offering 5K for the laptop if I buy a new one from them. Is it a good deal or can I get better value from market (Nehru Place)?