Can you link me to the thread you are referring to please.
I have an older pc after recently upgrading that may be suitable.
Thanks
here you go: http://forums.overclockers.co.uk/showthread.php?t=18528018
Basically, you download the latest img from expenology.nl and then install that to a USB stick that stays in the PC at all times, follow the new install process and voila after wiping the HDDs you will have a full blown DSM 5.1 install.
My issue was that all my drives where ReFS formatted after coming out of my drivepooled Server 2012 R2 and I had to load them in carefully in to DSM. I'd recommend using Synology Hybrid Raid and add two small drives first (after moving data off them) and then copy data off the next drive and then the next drive until all part of the SHR array, you'll lose space to start with but you'll have redundancy (via parity) and the ability to mount iSCSI luns

Main drive) / E: (Photo Drive) so i know that i wont loose "client photos" etc and also a quick way to restore my image(s) to reinstall if anything happens.
Stablebit is probably only really going to be of use if you went with internal drives so skip it if you do want a NAS.