The DCS: A-10C videos are from a game of the same name. It's published by Eagle Dynamics and sells for about $40 on Steam, Direct2Drive and from the publishers website. Be warned though, it's pretty hardware intensive. I'm running an i7 950 @ 3.5 with 6GB of DDR3 and a GTX 470 video card.
For flight controls I use the Thrustmaster Warthog HOTAS ($450ish), Saitek Pedals ($70ish on ebay) and TrackIR which is used to control the view and costs about $100. If you pick up the sim and need a joystick I recommend starting with a SatiekX52 Pro. You can get them as cheap as $50-60 on ebay.