The combo update is designed to work on all Mac machines that run a given OS (Snow Leopard for instance), so they will update any machine to 10.6.x. They contain the drivers for all machines, which is why I was suggesting you use that to update your machine since you will be using a MBP in the end and are using a Macbook to install to the drive.
Here is a link to the update for 10.6.4 on the Apple site: http://support.apple.com/kb/DL1048?viewlocale=en_US
Awesome! you rock! matter of fact, everyone on this forum rocks for their prompt and very helpful replies... minus the few trolls every now and then.