I want to build a PC for gaming mainly skyrim with high graphics and around 50 mods but have no experience with it. Is this possible for around 500$ I also have 2 4gb ddr3. What OS should i get and how much? My screen I have is 1680 x 1050, is that fine or should i spend more for 1920 x 1080. If not possible might be able to make it 700 $ including the price of the OS but would prefer 500$ including OS.