If you want to build a cost-effective machine, buy a pair of used H/T hex-core Xeons.  That is currently the apex of the power/price curve.  Higher core-count Xeons exist, but are very expensive.  Don't worry about them being used;  the Xeons are Intel's heavy duty industrial processors.  Prices for the older hex-cores run as...

• pair of X5650 Xeons (2.66GHz, w/3.06GHz turbo) HyperThreaded hex-core   >>>  a pair gives you 24 render threads  $140 US
• pair of X5680 Xeons (3.33GHz, w/3.6GHz turbo) HyperThreaded hex-core   >>>  a pair gives you 24 render threads  $450 US
• pair of X5690 Xeons (3.46GHz, w3.73GHz turbo) HyperThreaded hex-core   >>>  a pair gives you 24 render threads  $600 US

     Look for a vendor dealing in used commercial/industrial computer equipment, professional level servers and workstations.  You'd need a dual CPU motherboard (1366 socket).  With six DIMM slots, it will be ATX size (full tower case);  with twelve DIMM slots, the motherboard will be E-ATX.  Some full towers will take an E-ATX board, you'd need to check.  This motherboard will be 12" high and 13" front-back.  I got one of the six-DIMM ATX boards into a mid-tower case;  it has dual X5660 H/T hex-core Xeons and 48GB, for a total system cost of $1260 US.  For that much rendering power, it's a bargain.  I christened her Urania.  I name them so that I can identify them when networking. "Big_Girls" is the name the main network;  the smaller network (not shown) is "Lil'Gals".

     Speaking of networking, if it isn't some violation of copyright or whatnot, I'd be willing to run an animation render for you, Arrow1.  I have eleven rack-mount blades running dual X5650 H/T hex-cores, and a couple of workstations (Urania with dual X5660 Xeons, and Cameron with dual X5680 Xeons) on my main network.  That's 312 rendering cores all tolled, so I can make pretty good progress rendering in Vue.

     But I don't know if that's feasible, given Vue's content being locked to a license.

     As for the graphics card of a new system, for the purposes of Vue, the critical factor is the amount of onboard memory;  this will determine the quality of preview and speed of response to commands while building the scene.  Get a card with 4GB onboard, if it's within budget.  A given GPU chip will be available on cards with different amounts of onboard memory, for example you may see one GTX760 with 512MB VRAM, while another GTX760 has 4GB VRAM.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5