I don't know how much space you need, but this one has a lot of bells and whistles. You plug it in, setup username and password for shit and go.
http://www.newegg.com/Product/Produc...82E16822136307
oh yea, if you already have drives - you can just plug them into something like this, tho if they're small/older its probably cheaper to go with a new NAS:
http://www.newegg.com/Product/Produc...82E16822155009