Obviously this will be quite an investment for someone who doesn't really play games anymore. However, VR has always interested me.
What do you want VR for?
If you want room scale VR then you need to add in the cost of a 3rd or even 4th sensor which are £60 each.
I also bought a ~£75 USB card (StarTech PEXUSB3S44V) as I am running an old GA-Z77X-D3H (incompitible VIA chipset) motherboard with a 3770k. This one USB card has 4 dedicated ports unlike the cheaper options which allows me to connect the 2 sensors(may get a 3rd/4th) and the headset while keeping my front facing compatible intel ports free for storage.
You may also want some decent cable extensions which will add another ~£40.
Is it worth it? First thing I did was smack my self in the face with a virtual drinks can. Punched the shelves behind me a few times since and now can't raise my right arm from defending my castle gate with a bow and FLAMING arrows.
I paid full price of the Rift and the controllers. In my opinion, at this price, it's too good of opportunity to pass up. Your case is slightly different because you have to buy a GPU as well.
I see what you did there 
