before you buy Far Cry 4 make sure your PC will support it
it requires a quad core CPU as well as a Direct X 11 video card with at least 1 gig of vid ram ( the newer the better ) as well as 4 gig of system ram and a 64 bit operating system
DUAL CORE CPU"S ARE NOT SUPPORTED ..nor are some LOW end video cards
Far Cry 4 Minimum Requirements
MINIMUM
OS: Windows® 7 (SP1) / Windows® 8 / Windows® 8.1 / (64-bit only)
Processor: 2.6 GHz Intel® Core™ i5-750 or 3.2 GHz AMD Phenom™ II X4 955 <---*note* both are Quad core CPU's
Memory: 4 GB RAM
Graphics: NVIDIA GeForce GTX 460 or AMD Radeon HD5850 (1 GB VRAM)
DirectX: Version 11
Network: Broadband Internet connection
Hard Drive: 30 GB available space
Sound Card: DirectX-compatible
Additional Notes: Windows-compatible keyboard, mouse, optional controller.
RECOMMENDED:
OS: Windows® 7 (SP1) / Windows® 8 / Windows® 8.1 / (64-bit only)
Processor: 2.5 GHz Intel® Core™ i5-2400S or 4.0 GHz AMD FX-8350 or better
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 680 or AMD Radeon R9 290X or better (2 GB VRAM)
DirectX: Version 11
Network: Broadband Internet connection
Hard Drive: 30 GB available space
Sound Card: DirectX-compatible
Additional Notes: Supported video cards at the time of release: NVIDIA GeForce GTX 460 or better, GeForce GTX 700 series; AMD Radeon HD5850 or better, Radeon R9 series.
Note: Laptop versions of these cards may work but are NOT officially supported.
if you do meet the requirements buy the gold version .. the gold version contains all the DLC paks (the season pass) as well as a few more single player missions (*note all the season pass content has been released )
The Syringe Mission - accessible after completing A Cultural Exchange.
Blood Ruby - accessible after completing A Cultural Exchange.
Yak Farm Mission - accessible after completing A Key to the North.
Weapons are also added when you buy the Gold version
Elephant gun .700 Nitro - available immediately in the in-game shop.
Sandman 1911 Pistol - available immediately in the in-game shop.
Driller PKM - available immediately in the in-game shop.
Butcher’s Machete - available immediately in the Arena (the Arena is unlocked after The Mouth of Madness).
you'll also get the DLC for Valley of the Yeti (a separate single player campaign )
escape from durgesh (a separate timed single player campaign) <-- this is pretty challenging too ..as in not easy to complete

the overrun PVP game mode
and the hurk deluxe pak which is 3 missions
Speak No Evil - accessible after completing Sermont on the Mount ( Loginus Mission).
Call of the Wild - accessible after completing Speak No Evil.
A Familiar Feeling - accessible after completing Call of the Wild and Key to the North.
Harpoon Gun - Available in the shop after completing A Familiar Feeling.
with the limited edition you only get 3 Hurk missions + after completing them you get the harpoon gun
Speak No Evil - accessible after completing Sermont on the Mount ( Loginus Mission).
Call of the Wild - accessible after completing Speak No Evil.
A Familiar Feeling - accessible after completing Call of the Wild and Key to the North.
Harpoon Gun - Available in the shop after completing A Familiar Feeling.
hope that helps !
with the collectors edition you get some posters and a pagan min statue and the limited edition of the game
steel box version just means you get the limited edition of the game in a metal tin
so gold is the best value if you want the entire Far Cry 4 game , and the extra guns do come in handy at the start of the game