Hi
Rather than a seperate piece of furnture you could use our corner bracket;
M-Form Corner Bracket
This is specifically designed to hold the two small pieces of kit most people need, ie, a digibox and dvd player. This will give the look of the whole lot floating and the kit will swivel with your TV. This frees up the piece of floor otherwise taken up by the cabinet.
The only draw back for you is that you can't push it back to the wall flat when not in use. However in my experience, when people buy an articulated bracket with the intension of pushing it back flat it ends up with the TV permanently pulled out into the corner anyway!
Let me know if you need any more details.
Regards
Graham