I would worry more about you load temps. Do a Google search for intel linpak and download that. It's easy to follow and will load you cpu hard. I would also suggest running Prime95 for at least 12 hours (let it run overnight and in the background while you work) to ensure stability.
Dump the stock heatsink...there are many $30 sinks out there that will do the job you are looking for. As for your default vid, I would try 1.25 and then work down from there if you can while keeping it stable. Most i7's are in the 1.1 to 1.27 range...you just have to play.