Actually, it's not a bad idea to post your intended parts list. More often than not there is something that could be done better. Sometimes even for less money.
AND, unlike Colif's instructions on how to deal with wiping the drives, I think it's a much better idea to wait to do that until AFTER you've either cloned or done a clean install to the new drive and verified that everything is working ok first. And then wait a few days to be absolutely sure there are no issues with the hardware.
That way if there is any kind of problem with the installation or anything else, OR if the new drive suddenly fails on the second day, you can always put the old drive back in along with your other hardware so you are not without a system the whole time you are waiting to get the hardware replaced or sort the problem out.
It's really great to install new hardware, do a fresh installation on a new drive, wipe the OS off the old drive and then realize something is screwed up and now you have NO functional operating system on any drive.
Of course, that's only if you're planning on installing to a new drive, not if you're planning to do a clean install on the same drive the OS is currently on. If that's the case, then his instructions are fine.