For that I have Qnap TS-110 or Synology ds-110j in the next shopping list.
But, will WZR-HP-G300NH support the full gigabyte speed of these NASs (including jumbo frames)? as they were tested and they can easily go above 300mbps (~40MB/s) that's not what I get right now from this router :) , actually they are more than 8 times faster. So a dedicated NAS is the way to go I guess (despite the xtra cash of course).
I've just read about this limitation on other threads. However, I wouldn't like to close this thread in order to leave potential buyers understand the limitation of this still very good router.
It would be very appreciated if it could support usb printer with stock FW, but that's another great abilities of a dedicated NAS.
Anyway thanks for the answer Nick.