OK here is a ultimative config for the Photoscan, best price/performance from my long research......
AMD can install 48 cores and 512 GB ram and 8 GPUs,
its a AMD solution if you think is better with Intel then here with it. but basic system start at around 12.000 USD for system without CPU, RAM, GPU.......
http://www.supermicro.nl/Aplus/system/Tower/4042/AS-4042G-TRF.cfm base without CPU, GPU and RAM cost around 1.800 USD.
configured with 2 CPUs
CPU - 2x6128 (8coresx2) - 2,0 GHz - 16 cores@ 32 GHz
RAM 16x8 GB - 128 GB
HDD 2x500 GB - 1 TB
cost around 5.500 USD
for the GPU is best the 590 GTX - 2GPUs in one slot
maximal in this board you can have 8GPUs - with PCI-E extenders (40 usd for one, need 2x)
price for the GPU is around 600-700 USD as i know
so best start with 2 CPUs, one 590GTX, and 128 GB RAM at around 9.000 USD without OS.
and remeber if Bulldozer get out you can put there 64 Cores with over 75 % more horse pover as a 48 core setup.
every GPU consume one core of CPU, so with intel you will have a lot smaller performance, and remeber, intel have even the 10core monster but with price 4.500 USD just for the CPU !!
sou a comparable equiped Intel cost around 40.000 USD. search jourself if dont believe.....
in next 6 months will buy something like this, for cultural heritage program......