What is the best NAS system 4Me?

1st off thanks for a great website which I will be using heaps to help with setups.

I'm confussed with all the option available.

What I currently have in my house (Not a bussiness..)
- 1 TiVo (LAN)
- 1 Topfield (Wireless)
- 1 LG smart TV (LAN)
- 2 Desh top PC's (LAN)
- 2 Laptops (Wireless)

This is all run from my ADSL moden.

What I would like to do.
- Central storage to stop having the same infromation on each computer.
- Extra storage for the TiVo to record to
- Be able to download Torrents without having a computer on.
- Set my Printer to be able to be used by all computers. (This may need to be upgraded as it has no internet connection. Canon MP600)
- Set up iTunes on it so I can connect from any computer to update my iPods.. Is iTune the worse program ever? or is just my lack of know in setting it up?

I can get NETGEAR ReadyNAS NV+ RND4000 - NAS + 4 x Seagate Barracuda Green 2TB Hard Drive for just under $700 (Aus Dollars).
But from what I can find out these are old tec.

Any help or advise welcomed....
I believe I would currently fill 2TB with music & videos (TV shows included) I have.

Thanks
Darren