That Rosewill Photon is a good choice at a good price (this week).
EVGA SuperNovas may be better and come with a phat 10-year warranty, but they also cost more. You might find the extra cost is worth the promise of a full decade of hassle-free operation. Although, honestly, any PSU with a 5-year or 7-year warranty is going to be a solid product which will probably outlast the rest of your system.
I would actually buy an 80Plus Platinum, personally, but nothing wrong with Gold. 1200W isn't strictly necessary for your build (1000W should be sufficient, unless you overclock, but 800W was not really enough, lol) but an over-rated PSU will be more robust and have a longer lifespan and will even run a little quieter.
And half-modular is really no different from full-modular (every motherboard uses the same main power connector) so I don't think it's really worth paying more $ or limiting your choices to full-modular unless custom sleeving/cabling considerations are important.
My picks from newegg.com - similar to yours in specs (1200W, 80Plus Gold, modular, etc), apparent quality, and price:
LEPA G1200-MA ($150),
SeaSonic x-1250 ($190),
FSP Aurum Pro 1200 ($200),
bequiet! DPP 10 ($200). Sale prices next week (or the week after that, etc) might offer better deals, if you aren't in a hurry to buy the PSU for your system.
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