Nu Build- GTX750 1 GB/i7 4770 4600HD, MSI B85-G41. What PSU would be comfortable?

[rivrbyte]

Whew!
I had a Thermaltake 700W on my last seven year old rig, ( Still running, but it is 7 years old, and don't think it's certified for the new Mobo 12V system 1150 Socket/i7 4th Gen CPU's, otherwise I would just re-use this 700W in the new build....it's old, and maybe not performing at 100% any longer. Some have told me that 700W was way overkill of power, so this time I bought a Seasonic 550W, and now a few are telling me NOT ENOUGH POWER, to get at least a 650w or 700w again, but the Seasonic told me my 550 with have a max output of 600W....I'm worried about that.

For now I have the 1280 x 1024 Monitor, I will upgrade hopefully soon, to maybe a IPS LED 22"-24", up to 1200, or more expensively up to 1400 RES. Reading more articles about the CPU's 4600 HD Graphics outperforming GPU's overall, and processing 1080p video. I'm still hearing I do not need a GPU, and the onboard 4600 HD will be a good fit, for my light video-editing and Photoshop work. And NO, I will not game or Overclock.

"If you ever go 1080p or beyond; get a 770 with 4GB."

That's why I'm still somewhat confused, I sent Seasonic an email asking them what they thought, since they made the darn thing, and they sent me a *reference link:
"Yep, you need at least get a 575W, however, our 550W will have about 600W max output." What I boiought was a EVGA GTX750, and don't see any SLI, or Ti anywhere on the box, but this is the link.

*Reference link:http://www.realhardtechx.com/index_archivos/Page362.htm

Sounds like I 'd be living on the edge, if I don't get at least a 600w, or 650w PSU. I know you all will say just use the 550, but what would happened if it was still not enough, (not a good scenario) or I upgrade to a bigger GPU (for what, I have no idea) in the future. Then I would be stuck with this 550W. So better now, BEFORE I open the box and use it, I should still think about if I still NEED a BIGGER WATTAGE PSU.

I have STUDIO 15 HD ULTIMATE, I do have a Canon Digital that shoots AVCHD, so the consensus is for me to exchange the GTX750 for a GTX 770 with 4GB memory and up my RAM to 32 GB....but I'm still concerned about my 550W PSU not being enough power.

Thanks!