Advice on Media Storage for whole house distibution

I am relativly new to the the whole house media distribution thing and need some advice on a couple of things:

My Setup currently is as follows:

I have TVs in 4 places in the house I want to be able to watch ripped DVDs, as well as 2 different stereo setups where I want to stream music

Currently I have 1 PC with internal storage
- Windows Media Center 7
- XMBC plugin for WMC
- Media Center Master
- EventGhost
- MCE Controller
- MC Launcher
- WinLIRC
- MyMovies Plugin
- Samsung AllShare
- Media Browser
- Meda Center Studio

Media Creation and Viewing
- AnyDVD HD
- MakeMKV
- Haali Media Splitter
- Virtual CloneDrive
- Total Cinema Theater
- Media Player Classic - Home Cinema

TV/DVDs
- 3 Samsung Smart TVs, either 3D Plasma and LCD
- 1 Panasonic Plasma SmartTV
- 1 Mitsubishi NON-Smart TV
- 2 Samsung Smart 3D Blu Ray DVD players
- Sony Blu Ray DVD player

Now to my question, I need to work out the media storage and distribution to all these devices. I want 1 central location for it to be stored, and am not sure if a direct attached storage array to the PC is the best option, or a NAS device. Can anyone tell me what 1 over the other would be a better option?

thanks,

Jason

I should also mention that I have
- DVDs ripped to MKV
- Blu Ray DVDs as ISO
- 3D Blu Ray DVD as ISO
- 100+gb of MP3 music
- Home created Videos in MP4, or AVCHD format

My big picture plan is this:

Main Equipment Area
- All the stuff I posted above
- add on DVBLink

For extenders
- Main TV
- small HTPC with all the playback functions running WMC7

- All other TVs
- Raspberry Pi running raspbmc and the DVBLink client

What I am worried about is distribution, specifically when I start talking about streaming to these other TVs 3D media or Blu Ray media