WTB NAS with Raid support

Hi;
I am Looking for NAS; D-Link DNS 323 preferably or something similar. With raid 1 (what I know raid 1 is copy of the hdd on another hdd)so as to avoid down time and a full backup copy of my accounts at my office. D-Link dealer has given a price of 16k where as I have been reading price between 8 to 10k here at TE. Could anyone suggest where to buy from at the best price possible in Mumbai. Used or new is not an issue. Price and availability is all that matters. Any suggestions apart from D-link are welcomed.
Thankyou