Zyxel NSA-320 or 320S for Debian ? (and Open Media Vault)

Hi!
I want to buy NAS for home, and install Debian on it (for extending capabilities), I'm a programmer (c/c++ once, now java) so I guess I can handle it :)
I want cheap box for a start (maybe HP Microserver in the future) so I'm thinking about Zyxel NSA-320 or NSA-320S (it's hard to get 320 now).
Which one is better? I see that 320S has only 256MB of RAM, is it enough for Debian and OMV ? or should I look at 320 (it has 512MB)

razorjack,

For your purpose, 256MB is good enough. But 512MB of NSA320 is even better (room for growth). Some people even run OMV on GoFlexHome which has only 128MB!

-bodhi
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Thanks for info. So I probably get NSA320 or NSA325.
Unfortunatelly NSA320 is withdrawn from market (it has successor NSA320S with only 256MB), and I found only one seller with NSA320, but price is high (less than 10eur cheaper than NSA325v2).
I have serial-usb (FTDI I think) cable at home (from Arduino and other MAX chips)

I have the NSA325v1(512MB) and have not been able to get OMV working on it but want to. Could anyone suggest to good tut on getting OMV to work on the NSA325 running debian wheezy? Currently I am using webmin but really want to get away from webmin. I like the webinterface of OMV.

~SOL