Steam Games
$7 - Sleeping Dogs
PC Hardware
$22 Shipped - Asus Xonar DG PCI Sound Card
This card is practically new, only used for about 2 weeks before I had to move to a PCI-E version to better fit in my case.
$140 Shipped Each - 2x HIS Radeon HD 6950 2GB
These cards are the reference...
Once you run the installer you're downloading you will log in with your Steam account. Alternatively, in the future, you can input the activation key from your Amazon Games Library into Steam and it will download within Steam.
This is a fairly common problem with the wireless receiver. This might help you fix it without spending more money: http://blog.chase.net.au/index.php/2009/06/broken-xbox-360-wireless-receiver-for-windows/