Current System Specs:
• CPU: i7 2600K @ 4.4GHz
• Chipset: MSI P67A-GD65
• Memory: 8 gigs Corsair Vengeance 1600 DDR3 RAM 9,9,9,24,1T timings
• GPU: Asus GTX 570 OC'd 800/1600MHz/1910MHz
• HDD: WD Black 1Tb
• Soundcard: SoundBlaster X-Fi XtremeGamer
• Monitor: 23.6" FHD Acer GD235Hz @ 120Hz
• PSU: Cooler Master Real Power Pro 650
• Headphones: Asus ROG Orion
• Keyboard:Corsair Vengeance K60
• Mouse: Logitech G5
• Gaming Accessories: Track IR 5 Pro / X52 HOTAS / Pro Flight Pedals
Specs for the new build I am putting together at the end of this year:
• CPU: i7 5960X
• Chipset: MSI X99 chipset
• Memory: Corsair 16GB DDR4
• GPU: MSI 880GTX
• SSD: 1TB Samsung 840 Pro
• HDD: 2x WD 1TB drives
• Soundcard: Creative Sound Blaster Zx
• Monitor: 27" WQHD G-Sync Asus ROG Swift PG278Q @ 144Hz
• PSU: Cooler Master V850
• Headphones: Sennheiser G4ME ZERO BLACK
• Keyboard: Corsair Vengeance K70
• Mouse: Logitech G502 Proteus
• Gaming Accessories: Oculus Rift
If you have too much money - then why not. However, most probably you won't feel any performance benefit in ED from CPU upgrade. 2600K is more than enough for ED. Buying a $1000/1000EUR CPU is really questionable. There is already 850 Samsung SSD series. Why would you need 2x1TB HDDs, for raid 1? OR CV1 is expected to be released only next year. SoundBlaster upgrade is also somewhat questionable.
So I do not see any reasons for upgrading anything besides GPU and monitor. Also I do not see HOTAS or Rudder pedals in the list.