I've been looking around at various NAS systems such as those made by WD and Seagate. The storage sizes are great, but from reviews it appears that most of them have poor file transfer rates. Does anyone know of a NAS system that I could buy and/or make myself that can store 2TB+, preferably up-gradable later, that will transfer files fast enough to run 1080p video without delay, or play some games over the network? Looking to spend no more than $200 up front.