Planing to upgrade storage space on Vista wifi network. Right now I have a File Server which is commonly shared by all. Now I the file sever is almost occupied. It has 500GB storage. I want to upgrade that. This time planing to have a wifi storage system. My entire network is on wireless network and it looks that a wifi file server can be more helpful. I cannot put the existing system on wifi. But I am ready to purchase a external storage device like NAS. Size from 1TB to 4TB can be better. I need guidance on choosing the right device for Wireless network only. What I need is good storage space, good data transfer ration, etc. After adding a wifi storage device my entire network will be wireless. I can add up boosters if required to get more better data transfer ratio. What are your recommendations on the same. Which device should I choose. Thanks.