I've been using Windows 8, installed on my early 2011 Macbook Pro using bootcamp for about a week now and I'd say it's worth waiting for to get the $40 upgrade. There are some bugs but the only ones I've seen are those interacting with the function buttons on my Mac so, if you are installing on a previous Windows system I'd expect you to have a better experience. Otherwise the OS is very smooth and usable - the Metro UI can be annoying especially when trying to tweak system settings but third party applications can disable it. Hope this helps with your decision.
It sounds like it's most likely a video card issue. Try and swap out the video card for a different one if you have access and see if the problem is solved. Edit: Didn't see the integrated video bit. Try installing a dedicated video card.
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