the TM5402 is a great box, its turned out to be so popular, that everywhere is either out of stock, or has very limited stock untill the middle of the month.
it wont stream to the network, but can stream video files from connected devices on your network, and from the net itself. its HD, 3D capable and has 7 day EPG thats being improved with each new firmware release and favourite channel lists, its VERY user friendly, but obviously not as flexible as a linux box
the TM800. The whole 13 seperate packages that create the whole EPG package can now be downloaded with the remote control, giving you a complete self updating EPG. the choice of channel lists is huge, with a lot able to be downloaded via the remote, as well as rats channel list updating itself when an update is available (if you choose to activate this feature)
a LOT of work has gone into improving things on the TM800, for things like extra tuners, theyd have to be USB tuners, but i have stopped trying to get both a USB terrestrial and satellite tuner working in it, as the new OE based software has been 'a few weeks away' for a while now, so is it worth putting the work in, when i know itll be useless and have to start again when the new software comes out.
again, the TM800 can stream from attached network devices, and some websites, but at the moment, it cannot stream out, this is another thing the new software should fix