Is it better to build or buy a low to mid-range gaming PC? I would like to be able to play Civ 4 and 5, Sims 3 (with most expansions), Skyrim and AOE4 when it comes out. It will also be running Photoshop CS6 and Blender. I'm not a serious gamer, I only play occasionally, so I don't want to blow tons of money on the computer. Any advice?