Have a look at
http://www.topfield.com.au
They make a range of DVR's, all have a USB connection and some of the more recent models have wireless connections.
I have a T500pvrt that is a couple of years old. Recently updated it to a 400 GB disk and added a wireless connection so I can download electronic program guides from the internet as well as set recordings via a web server.
It's a great accessory for an astronomer who doesn't want to miss their TV while they are out in the cold observing.
BTW, some models are currently on sale at Myers