Check http://gaminglaptophome.com/cheap-gaming-laptops-under-500/

I think the Acer Aspire V3-571G-6407 15.6-Inch laptop would be perfect for you. It features with Intel Core i5 3210M 2.5 GHz (3 MB Cache) CPU, 4 GB SDRAM, 500 GB 5400 rpm Hard Drive, 15.6-Inch Screen and NVIDIA GeForce GT 630M GPU