If I am not mistaken, the thread you referred to was for 7.10. I don't think you need to do any of this on 8.10. But one thing after another...if you don't want to use your core for playback, then you don't need to invest too much work with drivers there. For starters, I would suggest you use basic skin and the UI1 with static images for your core. Should you decide later on to use it, you can still try this later. I used to have an eee-box before, which also used an Intel graphics chipset, but that handled only UI2 with overlay.
About your MD, I suggest also for start ui1 and static images. Use this to setup your MD. Once your orbiter is setup completely, you can go to KDE-desktop and check with your restricted drivers. I also had some trouble at first with my ASROCK Ion 330- I couldn't even activate the restricted drivers.
I put the avenard release repository, did apt-get update, apt-get dist-upgrade and reboot. After that, I went to the KDE-Desktop again, opened a terminal and did nvidia-xconfig, which wrote me a new xorg.conf. With the next reboot I forced the AVWizard and set it up to fullHD and UI2 with alpha-blending.
Try it out and let me know if it helped.
Now I have a question of my own: When I'm watching TV or movie, after some minutes the screensaver seems to kick in and blacks out my TV..how can I keep this from happening?