Upgrading to a newer platform, that makes sense for what you are doing. Overclocking, maybe, maybe not, but if this is a work related device and there is any chance for that work related data to become corrupted, probably not the best idea unless the platform itself is not doing what it needs to do.
I'd just upgrade to a newer platform, cpu, motherboard and memory, and then see if maybe you want to put some money into other aspects of the machine rather than overclocking. There are excellent fans to buy that will lower noise levels, RGB and LED lighting options, very quiet CPU coolers. Lots of other things and lots of mods that can be done to keep the fun flowing without subjecting your data to corruption from overclocking.
Don't get me wrong, I'm an avid overclocker. I'm just not sure I'd do it with a mission critical machine.