Hay GK when drilling holes, try this, after you have marked where you need to drill your hole.
If you don't have a center punch you can use either a sharp nail or a pop rivet with the pointy bit down of cause.
Once lined up to your mark, just give the top a "lite" hit with hammer on a hard surface. Not to hard or you will dent the surounding aluminium.
This will leave a small divet and you will find now that your drill bit doesn't wonder off.

Exa, No I was not kidding, like you said "its one of the best" and I pointed out "Even thou HK may not be the coolest WC block, temps wise."
The HK is now the second best block for cooling CPUs, first place now goes to Swiftech Apogee XT.
If you would like to see what Vapor had to say about it then here is a link http://vapor.skinneelabs.com/i7/Round2/XT/R2i7XT.html
Or if you would like to compare the HK to the XT then here is another link http://vapor.skinneelabs.com/i7/Roun...i7Overall.html

I still love the looks of the HK but the performance factor of the XT does have a slight pulling me, just a tad.