The Alpine iDA-X100 is a great receiver for people who transport all of their music on an iPod or MP3 player. The unit offers fantastic digital-audio integration without the need for a separate adapter, but should you ever want to just play a CD, you'll be out of luck.
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With the new interface and additional navigation features, the Alpine PND-K3 is an improvement over the company's previous in-car GPS, but the expensive price tag is a turn-off, especially when you can get more for less.
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The Xbox 360 Wireless Gaming Receiver lets you use wireless Xbox 360 peripherals with your Windows PC, but it won't be a must-have PC gaming peripheral until more compatible games are available.