You will most likely not discern a difference in computers for streaming radio, and all you really need is a streaming device. E.g.:the Squeeze Box, Airport Express, Apple TV and a host of others will be just fine. If anything, I would consider a separate DAC after those devices as it will make more of a difference than the computer or the streaming device. Just make sure that whatever device you choose is capable of streaming what you want to play.
But do do it, it is a big world out there with a lot to hear!
But do do it, it is a big world out there with a lot to hear!