So, brand new computer; but nothing to use it with! What you need is some good HMD input devices.
A keyboard
nothing needs to be special but you need a keyboard to use your computer, you cant go using onscreen keyboard or something your whole life, but get the cheapest one possible. I grabbed this from Memory Express and I love it.
http://www.memoryexpress.com/Products/MX25605
A keypad
I have a keypad and it's super useful for those games with no gamepad or hydra comparability. It's perfect because I don't have to try to find the keys my hand just sits. That said they are pricey and with more and more games getting support for other input methods it's really not worth it. I however bought the keypad for gaming (as I'm sure many of you are) and it's use for games and VR stuff has been awesome. So if your'e looking for one anyways it's a good investment though keep in mind you will probably just use it for non VR stuff in the near future.
A mouse
Again a must have, though nothing needs be fancy, left mouse, right mouse, middle mouse, scroll wheel are a necessity. Although an ergonomic fit is good for not having to look down to find the mouse. I enjoy side buttons and something to change DPI on the fly, but if money's tight at this point don't go for fancy features.
A gamepad
A gamepad like an Xbox 360 controller is amazing to have, so many games and demos have comparability I don't even think about it, I just grab the controller and put on my Rift. Anything you can get wireless that has super low latency is good in VR so I would recommend a wireless one though I have a wired and wireless from my old Xbox 360 and I'm using the wired because the wireless sounded too hard to set up and the wired was super easy.
Headphones
If you don't already have a pair don't go getting anything expensive, a pair of stereo (again Anything you can get wireless that has super low latency is good in VR) headphones. I'm still unsure whether to get and extension cord and use my usual earphones or get dedicated wireless headphones or earphones. In all it's not worth it because Oculus's CV1's built in audio will be well worth the wait. For more thoughts on this see this forum:
End notes
With all of the things on this list it won't be shameful to buy cheap or because Oculus is rumored to be working on input and might even have a development version of an input device before CV1 so go ahead and wait because what we have now isn't great so do pay for something great.
MOTHERBOARD: http://phantasmagoricvr.blogspot.com/2015/01/caelums-guide-to-making-mid-range-vr_4.html
CASE,
POWER SUPPLY, OPTICAL DRIVE, AND OPERATING SYSTEM: http://phantasmagoricvr.blogspot.com/2015/02/caelums-guide-to-making-mid-range-vr_10.html
