Why a server? Wouldn't a wireless hard disk to contain your movies and music, that you can access in in your Windows Media Player on your PC's and laptops be enough? Or do you have requirements you didn't mention?
I would like to start a Home Server, with which I can also stream movies and music. I would like to know what kind of OS, Hard Drives, the amount of RAM, and also what kind of already pre-made servers are there that are of good quality. I want to use it wirelessly, and also set it up with a virtual drive on my laptop. Thorough answers are very welcome.
I prefer microsoft, but am also linux savvy. Cost is important, but I don't mind spending more on the heavy side if it's worth the cost.