I don't know if it is still the case, but the last time I purchased a retail boxed HD (not just the bare drive OEM style) it came with software to copy the contents of the current drive to the new drive and make it bootable.
While Ghost will work if you have to buy a product I would recommend Acronis True Image instead. It is currently available for $20 after rebate from Outpost.com.
FRYS.com*|*ACRONIS
-Keith