I haven't looked at Linhes or Mythdora yet so I will give them a tryout. I agree that Myth does seem a bit of a 95% appliance,but as I've only looked at XBMC as an alternative, but it did have HDTV recording and playback.
We have the same problem here with our cable but I think we get a better deal as we have four freeview channels that broadcast 19 channels of DTV and HDTV. So until the cable companies stop leverage channel marketing (I would say that will be when hell freezes over)

. So I'll be watching freeview.
Anyways thanks for the response. I will start looking at the alternatives you have suggested.