If you're thinking about streaming from a NAS, buy whatever you want as long as it's not AC Ryan.
But if you plan on using local media such as a USB drive, then you'll "probably" not go insane.
It's saving grace is that it actually plays pretty much anything you throw at it.
The Fluxx could prove itself to be a very competent player.
A find it a bit too expensive since:
* Xtreamer Ultra came along
* You're stuck with AC Ryan firmware.
If it could run XBMC or Boxee then it would just be a matter of hardware/design preferences.