Have you already built using those components, or are you planning to build?
A psu cannot be "too much" as the system will draw only what it needs. However, if you are looking to spend less $ to build using the above parts, a solid (corsair, xfx, seasonic, antec) psu will be fine. As a note: unless you are gaming above 1920x1080 (1080p), you really don't need a 4gb gpu, nor do you need more than 2x4gb ram.
The only real negative to a highly overprovisioned PSU is lower efficiency. A PSU operates most efficiently in the middle third of it's range.
Your 1200w psu will be loafing.
But, regardless of the max capability, it will draw only the power it actually needs.
If you already have it, keep it.
If this is a prospective build, a 650w psu can handle most any single graphics card.
For a new build, I would not go with last gen parts.
Look at a 4670K, a GTX770 and a Z87 based motherboard. No value in an expensive motherboard.
Intel 330 is old tech, look at Samsung evo.
There's no such thing as a PSU that's too big. Your system will draw what current it requires from whatever it's plugged into. What you get with an oversize PSU is headroom and understressed components. Using a PSU that's "just big enough" is like driving your car in first gear all the time. Yes, it will work but will surely fail sooner than if you changed gears into high. Any PSU running at 50% of rated wattage will outlast any PSU running near !00% of rated capacity assuming similar quality levels. It makes no sense for you to buy a smaller PSU. Enjoy the knowledge that you will always have sufficient power.
You actually need only a 500w psu to power your pc. Most of that is used for the GTX680.
It will actually draw much less normally, only needing 500w while playing graphics intensive games.
The other parts take minimal power.
To save electricity, use sleep to ram(s3) when not in use. The power draw will be minimal, and the sleep/resume process will be only a few seconds.
You didn't mention what brand it is which might factor into some opinions however IMHO everyone should have an oversize PSU. Personally, I try to never load my PSUs past 50% of rated wattage. Consider it an insurance policy and an inexpensive one at that.