The TUSL2-C is a pretty good overclocker. In fact, it's the board of choice for overclocking tualatin celerons. And I know it will hit at least 1.8V.
That Gorb is not much better than a stock heatsink, I'm afraid. That doesn't mean you won't hit 933 with that cpu, but if you don't already have the heatsink, I'd buy something else.
Try a Thermalright SK-6 for about $13. You'll need to buy a fan with it, but, if looks are important, this shiny copper heatsink and a fan with LED's will make that orb look pathetic. And it will massively outperform the orb.