I need a NAS for office. will use raid 1 for back up. considering 2100 versus 3200. 3200 has some bad reviews and hard to find, so will go with 2100. BUT need 2x 750 gig drives and 2100 supposed not rated for this size drive. Has anyone used 750 drives with this machine? Does the usb camera module work? These are the features which draw me to the 3200. comments appreciated.