just a thought, would it be better to buy the rock early and leave it out dry so any baddies are killed off? i.e for a month while the tank is being drilled etc (should i decide to do that)
No the rock will die (both the good and bad) if it is left out of the water. It can take upto a year for it to become Live Rock again. Please do not buy to rock yet. Plus if you are buying your rock from a break down it shouldnt have any nasties on it!