It is worth noting:
LinuxMCE requires tuner cards with analogue inputs MPEG acceleration.
This means cards like the Hauppauge HVR-950 will not work without some additional engineering to create an MPEG encoder sink.
Because LinuxMCE isn't just MythTV.
There is a legacy AV mode which can be used to display the output of existing AV equipment, such as your cable box, vcr, blu-ray player, etc. And if it is hooked up to a tuner card, it can be streamed around the house. But in order for this to work, our Xine_Player expects a stream it can deal with, either MPEG-2 or MPEG-4 in other words.
Please weigh this into consideration when asking for cards. It is a must.