Intel Core i7 920 retail heatsink.
I'm ordering one next week and have a tight budget so I won't be able to order an after-market HS just yet.
I will be OC'ing too and know from previous experience that as long as the volts are left alone i'll be fine. All I wan't is 3Ghz from this chip and i'm sure I can get this speed without volts and a big HS.
Does anyone have a picture of the heatsink that comes with the retail i7 CPU's?