I'm a little bit unsure of what your saying / current PC storage status - are you planning on adding an SSD anytime soon?
For obvious reasons, it's always recommended to put your OS onto an SSD (rather than an HDD) if you have one included in your storage options. If you are going to add an SSD in the future then there's also no issue doing this via a current image of your old HDD OS. Of course you'd then need to do some housekeeping to remove the old OS.