As far as I know, there's no way to just move installed apps to the new storage drive. Apps will have to be uninstalled from the SSD and re-installed to the HDD.
On the other hand, data such as photos, music and documents can be moved to the new HDD drive when you get it no problem.
Either way, you shouldn't have to re-install Windows at all.
Okay. I just wanted to double check. Thanks man!