Looking to buy a pc to use for VFX / Game design

I'm looking at buying a computer to use for vfx, game design, graphic, and high end 3d modelling and rendering.

Not sure if I need a workstation or Pc maybe someone could advise me on this ?

( from what I have researched I think I need a workstation using xeon processor, nvidia gtx graphics card and asus or evga motherboard but advice would be must appreciated )

One thing i do know i need is a nvidia graphics card ati does not work correctly with Maya viewport for high detail.

programs i use are:

3ds max
Cinema 4d
After effects
In design
Looking to spend around £1300 or under ( Uk )
Main feature I want is fast for rendering and been able to be left on for days or even weeks without crashing if possible?

Best website I have found so far is:
PCSPECIALIST.CO.UK - Custom PCs, Custom Computers, Custom PC, Desktop PC, Custom Built Computers, Gaming PC

has anyone used them before? if so what are they like?

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