a few suggestions...
Disclaimer: I for one hate when people generalize and say something sucks or no one should get it, simply because it doesn't necessarily meet their personal needs. So I'm not going to do that here. If you like this HP server, and want it, and think you're making a smart buy, then go for it. If you're looking for suggestions, continue reading.
That said....
I would suggest that anyone who only has Macs and is looking for some of the features that this HP has to consider a different route.
If you have access to an unused Mac that isn't too old, and has modern I/Os, I would start there.
If you don't have an unused machine, and you need to stay at this "low" price point that the HP has, I'd suggest getting a Mac Mini. $99 will get you a 1TB multi I/O drive from MicroCenter.
Giving you all the reasons in this post would take forever, but here are just a few.
-Using an older Mac, or a new Mac Mini, with only 10.4 or better, you will have no need for a monitor, keyboard or mouse (after initial setup). You will have to have 10.5 on at least one networked (client) Mac, and you will be able to Remote desktop into the Server Mac to control it.
-For using it as an iTunes server, simply leave iTunes w/sharing enabled at all times, and Mac/PCs on your network will be able to play any and all music on it. Using Remote Desktop, you can access the server to get into iTunes to go to the ITMS to make purchases to download directly to it. If you already have the music elsewhere, simply use File Sharing to copy the music to it to build the library. You can even use iTunes for video purchasing and management, but it won't be available to the other Macs through iTunes Sharing. However there is a very simple solution to this I can explain another time.
-I've even ripped DVDs to hard drive, placed the resulting Video_TS folders into an organized folder structure, and then used File Sharing from as many as 6 simultaneous Macs on my network to access 6 different DVD rips through their respective Apple DVD Player software. Voila!! A hard drive based DVD jukebox network server.
-blah blah blah
The moral of this story is this. If you are a Mac owner, it would be wise to use a Mac running Mac OS as a media server, because you will have better opportunity to take advantage of all the various features and abilities of the Mac OS to do almost anything.
That's not to say you couldn't use a PC in a Mac environment to do the same. But I would ask, what sense does that make if the person only has Macs in the first place?
If enough people are interested and request it, I could take the time to start a thread that gets into more of the details, in/outs, of what I've said above.
Good luck to all of you wanting to jump into this niche of the market!!!