Look for P35 boards, they are excellent, especially ASUS P5ke if you're into OCing. I'm not sure these boards offer integrated graphics though, but this can be easily solve by buying a cheap video card.
Im looking for 2 things, the cheapest motherboard to handle HD playback onboard?
And the best motherboard with the best onboard graphics card so far.
Im an Intel dog
Thanks,
Peter
Unfortunately(for you) the best to say would be the new AMD chipset, the 780G. Not only that the integerated graphics OC almost 100% and bring very nice real life gains. They even were able to run HD video content with a sempron +3200. Now thats pretty amazing, especially for under $100. Literally this board is calling out your name to buy it as it fits exactly everything you want dead on(with the exception of being an intel dog). But lets be real and not let a name overcome the ruler of all, money...
The best motherboard chipset, by a huge margin, would be x38/48. By saying "with onboard graphics," you've just limited the choices to the oldest and worst chipsets. Unlike AMD, Intel just don't have half decent onboard graphics options available, thus, they don't make fool of themselves by putting such trash on higher end boards.
Intel's thoroughly beat here. The AMD 780G hands down. The Nvidia 8200 chipset (also for AMD CPUs) isn't too shabby either, but offers less performance.
On another note, keep the rated wattage of the AMD CPU below 100W for most 780G boards - they don't have the proper power regulation to handle the higher power consumption of higher-watt CPUs (at least not without active mosfet cooling... again, check Anandtech).