I am getting a new Dell PC with following Configuration. I am going to use a 46 inch OR 55 inch TV as my monitor so I can do regular computing as well as use it as a Home Theater PC. I am not going to use it for gaming at all. Intel i-7 3.4 GHz Processor 12 GB DDR3 RAM Windows -7 Ultimate Integrated 7.1 Channel audio Hauppauge® WinTV-HVR-1200 Hybrid Analog/Digital TV Tuner They are giving 1GB NVIDIA® GeForce® GT420 as default video card. And they want almost $ 100.00 Extra for 1GB ATI® Radeon™ HD5770 Graphics Card Should I pay extra for Radeon HD 5770 ? If yes, What will it do that NVIDIA won't ? Thank You.