OP, voltage depends on your stepping.
I have a B3, and prime stable, 3.6GHz @ 1.51v. Anything lower, and prime95 errors out. I've heard G0 stepping to reach 3.6v @ around 1.40v-1.45v
Alot of people confuse vid with vcore, btw.
Depending on your vdroop and vid, you can go lower.
As far your temps at Idle, it's a tad high for 3.6GHz. With my B3, I idle at around 37C-39C @ 3.6GHz.
I'm not sure how the 9700 HSF performs, but a couple things you want to be sure of, proper hsf mounting, TIM application, case air flow, and AMBIENT ROOM Temperature. Remember, you can't get cooler than your ambient temp. Your delta temp from ambient makes a huge difference in your final numbers. It's pretty much your baseline.