Im just about to complete my PC upgrade by adding water cooling to my new Opteron 146
However during assembly i have had a mishap with my radiator (Alphacool NexXxoS Pro I)
and its leaking water everywhere now with this radiator i was planning on mounting it beneath my PSU. However i now plan on buying a bigger radiator (something along the lines of Alphacool NexXxoS Xtreme III -

but i will have to mount it at the top of the case. Does anyone know any good templates i can use to drill out the top of my case so its the correct size and shape??