need help with my new build

[mimorex]

hello all,my 6 years old pc is very outdated so thinking of upgrading it but im confused what to do bmy options are and btw i already have a asus strix gtx 960 2gb ddr5 and also i have 6 gb ddr3 ram,corsair cx600 psu and wd blue 1th 7200rpm hdd
1.intel core i5 6600k+asus pro gaming z170 mobo+8 gb ddr4 ram+corsair spec 3 cabinet
2.intel core i7 4790k+asus maxumus VII Ranger mobo+corsair spec 3 cabinet
3.intel core i5 4440+asus maxumus VII Ranger mobo+corsair spec 3 cabinet
and also if i go with option 1 and 2 i might not be able to buy an extra gtx 960 which i am planning in near future.any help will be appreciated.thank you.
and all i wanna do is gaming and want to last my build atleast 5 years from the date of build.especially the cpu and mobo which i dont wanna change for minimum 5years,gpu can be changed later on but not the cpu and mobo

 

[N3rdR4ge]

if anything i'd say 1. but fill this out if you want better advice: http://www.tomshardware.com/forum/353572-31-build-upgrade-advice

 

[mimorex]

Approximate Purchase Date: e.g.: november 1st week 2015

Budget Range: 40k INR or maybe more depends on the situation

System Usage from Most to Least Important: (gaming, surfing the internet, watching movies)

Are you buying a monitor: No



Parts to Upgrade: (e.g.: CPU, mobo, RAM) *corsair cx600**

Do you need to buy OS: Yes
Please note that if you're using an OEM license of Windows, you will need a new one when buying a new motherboard.

Preferred Website(s) for Parts: amazon.in,snapdeal.com

Location: guwahati, Assam, India

Parts Preferences: I would like to upgrade to Intel CPU and asus motherboard and gskill or corsair ram

Overclocking: No

SLI or Crossfire: Maybe

Your Monitor Resolution: 1920x1080

Additional Comments: dont want to upgrade my cpu and mobo for minimum next 5 years
And Most Importantly, Why Are You Upgrading:my system is too old to kepp up with new gen