Basically this is the way I'd do it if I was migrating my OS. However, once you've backed up all your personal files, which you don't want to lose and after you make sure that you can boot to Windows with the SSD alone (with all other drives disconnected from the mobo), I'd recommend that you reformat the HDD, so that you have a fresh secondary storage drive with no traces of the old OS, programs and files. After that go ahead and put back the data you've backed up beforehand.
There's no point to backup programs and games (except for save game files). It's highly recommended that you install those from scratch.