HP LX195 Home Server or WD My Book World Edition 2TB ??!

I'm currently looking for solutions for network based media storing and sharing. I want something that will stream media to my PS3 and can be used to store data and share it locally.

Based on the research that I did, I found the following two options to be suitable for me in terms of price and features :

Western Digital WDH1NC20000N My Book World Edition 2TB

http://www.amazon.com/Western-Digital-WDH1NC20000N-Gigabit-Ethernet/dp/B001UHOR7O/

HP LX195 MediaSmart Home Server

http://www.amazon.com/HP-LX195-MediaSmart-Home-Server/dp/B0021L9HKK/

To me, both of them can do what I want plus more :

Can stream media
Can store data and share it

+ Can perform regular backups of any system
+ Data can be accessed from the internet

However, I believe that they use different methods because one is a NAS and the other is a server (Windows Home Server to be exact).

So the question is, Should I get the HP LX195 because it's a server and it will perform better
or
the performance is the same and I'm better off with the WD My Book World Edition and take advantage of the 2TB of storage ??!

Well, oddly enough neither one of them.
I've settled for an Acer Aspire AH340-UA230N Home Server which is better than both because based on some review the My Book World Edition has low streaming bandwidth and unlike the HP, the Acer storage is expandable and at the same time cheaper