If you want to buy PS 5 right now, just buy a high end gaming PC
When PS 3 came out, a lot of computers were already ahead with technology
The PS you buy now will last for quite some time meanwhile PC is meant for upgrade purposes
I would definitively go with a PC which would cost nearly the same
Buy a 7870HD GPU and you are ready to go
I personally have a 6770HD GPU and it runs every single game on the market
Also, graphics won't be upgrading for quite some time because for the first time the Mohrs law is not true
You won't see a PC performing double the speed of current ones until 2.5 years
Even GPUs are getting pretty awkward.
If you look at it, my 6770 which is a rebranded 5770HD released in 2009 (depending on the brand)
still can open every single game in 1080p
You can buy a 6770 and PS4 only has 1.84 TFLOPS
Look at PS 4 specs:
http://us.playstation.com/ps4/features/techspecs/
If you buy a 7870 which is a 2.5TFLOPS you will be greatly satisfied
You can buy one used for as low as 130$ and that makes total sense
Why would anyone buy a PS 4?
Here are the specs of all 7xxx HD series from AMD GPUs
http://en.wikipedia.org/wiki/Radeon_HD_7000_Series
Also here is a pic of 7870 so you get a better idea (this is larger than MINI PS3 LOL)
http://rog.asus.com/wp-content/uploads/2012/03/HD-7870-cover.jpg
Seriously, better buy a PC GPU