Mostly got the little bugger together, though it is fighting every step of the way.
The PCI slot doesn't seem capable of running more than 1 PCI device, so currently stuck with a single tuner card (with dual tuners). PCIe dual tuner now on order (not that I mind, can't wait to get rid of these bloody awful Nova 500 DT tuners).
Thrown Windows 7 on there, as buggered if I can find a Vista DVD about anywhere. I've go plenty of licences, just no DVDs! All the Vistas we use at work are Enterprise versions, which is a different DVD to the retail DVD. I will go back to Vista once I have the a DVD, purely because it'll take MS a few patches to iron out the abnormalities. Tempted to go back to XP MCE 2005 to fix the audio problem, but I need Vista or later for the hardware video playback.
Remaining problem, and its a Microsoft problem introduced with Vista, is audio. Under XP, you could have simultaneous audio from different devices - eg analogue ports and SPD/IF. Vista prevents this (and as far as I know, only Realtek drivers have a special fix for it), so that leaves me with a problem:
I want audio to come out of hdmi port (so its easy for her to use), but also out of one of the spd/if ports so I can connect to amp when I'm watching a film. Current line of thinking is doing it external to the PC, combining SPD/IF back in to the HDMI, or even splitting SPD/IF off to stereo jack into into telly (active when vga port used), and ignoring HDMI altogether.