The folks from MvixUSA have developed there own Media Center device that has received very little press but it quite impressive. The best part you decide what size Hard Drive to put in it and you have and all in one media center.
The system will handle nearly 2 dozen video formats dozen audio formats and a several image formats. They also have a device coming out that has all of the above features plus DVR functionality built in.
Price point is between $199.00 and $299.00