How long will this build last me?

Ok, so right now I want to play games like BF3 and MW3 and Crysis 2 at max settings on 5670x1080, then overtime decrease that resolution to 3840x1080 on a triple monitor setup.

CPU - Core i7 3770 (not unlocked, will use mobo utilities to take it to 4ghz)
GPU - XFX HD 7850 (Will overclock to a core clock of 1.2ghz if possible)
Mobo -
ASUS LGA 1155 - Z68 - PCIe 3.0 and UEFI BIOS Intel Z68 ATX DDR3 2200 LGA 1155 Motherboards P8Z68-V/GEN3

Ram - Corsair Vengeance 16gb (Ram has gotten so cheap over the years, it only costs $90...)

HDD - 1tb Caviar Black WD Sata 3 6 GBPS 64mb cache

SSD - 64gb OCZ vertex 4

So yeah those are what I like to call the replacement components, those are the ones that you should be replacing because there isn't a need to replace your sound card or PC case or PSU unless they break, they don't contribute to the performance all that much.