Will this be enough?

If your purpose is just games, I'd suggest starting somewhere around here:

PCPartPicker part list

CPU: Intel Core i5-4670 3.4GHz Quad-Core Processor ($184.99 @ Amazon)
Motherboard: ASRock H97M PRO4 Micro ATX LGA1150 Motherboard ($84.98 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($76.99 @ Newegg)
Storage: Crucial MX100 256GB 2.5" Solid State Drive ($109.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($69.99 @ NCIX US)
Video Card: Sapphire Radeon R9 290X 4GB Tri-X Video Card ($528.99 @ SuperBiiz)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($60.74 @ Amazon)
Total: $1196.66

CPU overclocking is almost negligible in games. The extra money you spend on an unlocked chip, extra cooling, etc shows minimal returns compared to putting that money into a beefier GPU. If you routinely do other, more CPU intensive tasks ( particularly those that use multiple cores, ) then the OCing starts paying off.

As it is, this build is possibly even overkill for single-screen gaming. You could save some money and drop to a regular 290 and I doubt you'd notice the difference most of the time. But if you want the absolute top-end for the money, and want a GPU that will last as long as possible, you can do that too.

The main juice you'll be squeezing is more electricity, heat, and money. By the time you hit the point where OCing the CPU is how you keep your system feeling fast, you should start looking to upgrade.

Look at the Nehalem chips. They're still going fairly strong and don't need to be OC'd to feel fresh. Considering it's six years old, and should be perfectly viable for another 18 months at least, I think that qualifies as good longevity. My Sandy Bridge machine I built three years ago ( still at stock speeds, ) shows no sign of slowing down, and I can't think of a reason it won't be just as much a gamer in 2017 as it is right now ( with a GPU upgrade, of course. )

Chips and components are lasting longer than they did ten years ago. Barring some huge software paradigm shift, there's no reason a good, strong Haswell i5 won't be more than viable for at least five years, bare minimum. The CPU alone is rarely the bottleneck, it's the mboard and platform as a whole. You don't support newer instruction sets, your memory controller is slow, your bus speed and lanes are limited, etc. Simply speeding up the CPU doesn't offset the rest of the limitations.

Getting five to six years of good gaming out of a platform is perfectly respectable. If you can go seven, you're lucky. Beyond that, and maintaining maximum framerates in games during that time span, simply isn't going to happen unless you've got a lot more money than brains.

well i dont know games are getting more advanced but then again who knows what the future holds. he could try overclocking since its a benfit of pc building and if he want maximum fps(5-10 extra) he could overclock.

The thing is, when you're building on a budget, you're working with a zero-sum sliding scale. Taking my last build list as an example, you're looking at $50 more for the CPU, $30 more for CPU cooling, and $45 more for an OC friendly mboard ( a Z87 mboard will save about $15 there. ) In all, that's $110 - $125 extra. What sub-system(s) are you taking that money away from? Either you drop the SSD and get a cheaper case or tone down the GPU. I consider the SSD too important to drop. A single good case now can be used in many builds down the road, which saves money later. So the obvious place to cut is the GPU. That looks something like this:

PCPartPicker part list

CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($234.99 @ NCIX US)
CPU Cooler: Xigmatek Prime SD1484 90.3 CFM Sleeve Bearing CPU Cooler ($29.99 @ Amazon)
Motherboard: ASRock Z97 EXTREME4 ATX LGA1150 Motherboard ($130.99 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($76.99 @ Newegg)
Storage: Crucial MX100 256GB 2.5" Solid State Drive ($109.99 @ SuperBiiz)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($79.99 @ NCIX US)
Video Card: Sapphire Radeon R9 290 4GB Tri-X Video Card ($379.99 @ NCIX US)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($60.74 @ Amazon)
Total: $1183.66

So even if you get a few extra frames from OCing the CPU ( which doesn't happen in all games, ) does that make up for the frames you've lost by dropping to a weaker GPU? ( which happens nearly all the time. )

Personally, if I were to spend more than $200 on an Intel CPU right now, I'd opt for the Xeon E3. I get i7 grade L3 cache and eight logical cores without the OC option. That's fine for me because I dabble in tasks outside of gaming that use those extra resources. Pure gamers probably don't care about them. Since you don't need an OC mboard or CPU cooler for that, you can still squeeze in the 290X for just a little over budget.

PCPartPicker part list

CPU: Intel Xeon E3-1230 V3 3.3GHz Quad-Core Processor ($238.98 @ SuperBiiz)
Motherboard: ASRock H97M PRO4 Micro ATX LGA1150 Motherboard ($86.98 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($76.99 @ Newegg)
Storage: Crucial MX100 256GB 2.5" Solid State Drive ($109.99 @ SuperBiiz)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($79.99 @ NCIX US)
Video Card: Sapphire Radeon R9 290X 4GB Tri-X Video Card ($528.99 @ SuperBiiz)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($60.74 @ Amazon)
Total: $1262.65

To icarsis specifically, any of these build lists are ridiculously powerful gaming machines. Will they completely max out every game on SuperMegaAwesomeWOW detail settings and pull 60fps minimum? No. Some games are just incredibly demanding. Will they play the vast majority of games at 1080p60 with very high settings and look fantastic while doing it? Absolutely. In fact, if it was me, I'd take the first list I posted, drop the GPU to a 290 or maybe even 280X, and bank the extra money. That will still play games fantastically well. Just because you have the money to spend, doesn't mean you need to spend it.