Need help to Build a System that make fsx smooooth with big addons

Hello ,,,

Guys i need a help to build my new system for fsx

budget will be 2000 to 2500 USD

now i'm planning to get a six core processor 5930k because fsx need cpu power more than gpu

anyway

my setup will be :-
Core i7 5930k
EVGA ACX 980 GTX Ti
Corsair Vengeance DDR4 2133 Mhz 32 GB
MSI A99S Gaming 9 ACK Motherboard
H100i GTX Cooler
2x Savage 480 GB SSD @ Raid 0 for Windows and FSX
PSU 850 Watt Cooler Master Silent

and keep in mind hyperthreading will be on and will overclock the cpu to 4.5 to 4.8 GH

i think its will be enough for fsx but i had read many things that say PMDG 777 kills alot of frames so need your advice  for best tweaks because i will install alot of addons like REX 4 , Flytampa + Aerosoft Airports , PMDG 777 and Aerosoft A320 Extended ,,, etc

last thing do you think 8 cores will run fsx smoothly more than 16 core because i'm thinking to get the new cpu 6700k and overclock it to 4.6 GH

waiting your answer and help