Already this has been chosen as the best solution but zeyuanfu still if u have not purchased the parts and since
u have the budget then I would recommend some changes:
CPU:Intel Haswell-E i7-5960x 8 core 3ghz
Memory:32gb(4x8gb) ddr4 2800 or higher, look for 32gb more than the speed, since 2666 will also be enough.
Storage: Samsung 850 pro 512gb SSD
Video Card: Instead of Quadro6000 go for Quadro K6000 12GB GDDR5
Again I mention its not that above system is not good but since you have the budget you can make a killer machine.
Enjoy with the system let us know with its performance especially about some big time consuming renders.