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All Apple iPods are compatible with Windows 8. All you need is the latest iTunes application installed on the computer : http://www.apple.com/itunes/download/
Here are some of the Clock Radios from Apple's Online Store
iHome iD95 Dual-Alarm Stereo Clock Radio : http://store.apple.com/us/product/H9508VC/A/ihome-id95-dual-alarm-stereo-clock-radio-for-ios-devices
Philips DC290 Docking Clock Radio with Remote : http://store.apple.com/us/product/H1663ZM/A/philips-dc290-docking-clock-radio-with-remoteiHome iD99 Triple-Charge Dual-Alarm Stereo FM Clock Radio
All the iPod models are compatible with Windows 8. Also, all the iPods except the iPod Touch 5th Generation model are compatible with the Clock Radios listed above.
Most of the clock radios for iPods have 30 Pin Dock connector, but the latest iPod Touch 5th Generation doesn't have 30 Pin Dock Connector, but has the Lightning Connector.
So if you are getting the latest iPod Touch 5G, you have to buy the Radio Clock which is compatible with Lightning Connector.
If you are getting other iPods, then you can buy any Radio Clock that have the 30 Pin Connector.
Please let me know if you have any questions. Don't Rate my answer until you are satisfied.