Can't help you with building your PC. because i'm building mine for 4250$... After 0.5-1 year i'll complete it.
PC that i'm making now is:
Motherboard: MSI BIG BANG-XPOWER II
Processor: Intel Core i7-4690X Extreme
RAM: HyperX Beast 4 of them (32gb)
Cooler: Noktua Nh-D14
Video Card: Inno3D iChill GeForce GTX 780 HerculeZ 3000 (2 of them)
HDD: WD Red 3 TB NAS Hard Drive
Box: Cooler master cosmos 2
Power: seasonic x 1280 go for gold x series.
If anyone can give me any advice about that also, you free to say. Maybe i'm building something wrong...