I am planning to take my old Dell 755 PC tower and make a KODI home theater system with it. It has 8 gb ram but just has on-board video. I want to hook it up to my 1080P 55" TV ... no plans on 4k streaming just HD 720 or 1080. Any recommendations on a good "get-r-done" low cost option for the graphics card? Plus any other over all tips would be much appreciated.