Original plan was to go all-out and have 4 Titan X Pascals and really just have an absurd machine that matched (and out-specced) the nvidia DIGITS devbox for about 65% the cost they were asking (~15k)
But I started to be more realistic as to how it is going to be utilized, and a lot of the uncertainty of what the nut machine for doing dl work locally would even be 12-18 months from now, with companies like AMD even just the other day announcing their new chips, Intel acquiring Nervana in Aug (brilliant), TPU's potentially lingering out there, other custom hardware, etc.
So I opted to go with just a single Titan-X for the time being which allowed me to save money on the cpu (i7 6800k) and motherboard (asrock taichi).
Looking forward to the new Samsung 960's to ship and the gpu to arrive.