First time buying a laptop I've been looking around many places but I get mixed reviews.

Here's What I need:

Laptop's main use: Hooking it up to my 46" TV to watch videos (need HDMI) ,
heavy multitasking, and some casual gaming.

Prefer: A screen bigger than 15" , 4gb+ RAM, A decent graphics card (no integrated) and audio, Do not really care if it is refurbished or used.

Budget: Around $600 - 700 (can spend more if needed)

Thanks. Will give +rep

I'd say check the Dell Outlet (http://outlet.us.dell.com/ARBOnlineSales/Online/InventorySearch.aspx?brandId=2201&c=us&cs=22&l=en&s=dfh) for XPS 15 laptops - nice solid machines that will fit your price point.