I am selling my 6 month old Apple Time Capsule - 2TB. It has built in Wireless N and acts as a backup server for all of your files. It also has the option to plug your printer in to make it wireless so you can print from anywhere in your home. If you want more info on it you can go to apples site here.
I paid 500 for this 6 months ago but I really do not use it as my work gve me Juniper SSG5 that I am now using.