I did some research and this is the workstation I suggest for number crunching purposes. At the time of writing (2015-29-05) it costs ~1000$:

Component Mark number price Total
CPU Intel 5820k 1 389.99 389.99
Mobo Asrock X99-Extreme4 1 190.99 190.99
PSU and Case cooler master 2 58.25 58.57
mouse and board logitech 1 14.99 14.99
Harddrive caviar black 1 70.31 70.31
Wireless Card Tp Link 1 15.89 15.89
RAM Crossair, DDR4- 2x8Gb 2 76.99 153.98
monitor Asus 24" 1 174.99 174.99
Graphic Card Geforce GT 730 2Gb 1 74.99 74.99
      Sum 1144.7
      Tax(CA-10%) 114.47
      Total 1259.17