Was looking for pretty much the same as you, but network connectivity was big for me. Looked at a Drobo, but the networked version is ridiculously overpriced.
Ended up with a Synology DS 411j - so far so good. Great user community - amazing what this little thing will do (i.e. - ability to hook up IP cameras and record video, in addition to the obligatory NZB and torrent downloads).
http://www.kitguru.net/site-news/ann...ds411j-review/