I have not had any issue's with APW3's.  They are what Bitmain recommends with S7/S9.   I personally have followed this and not had any issues on the PSU side.  They have kept working for quite a while now on some as I sold S7's and kept the APW3's.    They can power even the batch 1 S9's which had the highest hashrate's.

There will always be market of server PSU's with breakout boards out there.  But until I have a problem I will keep using APW3's as far as S9's at this point.   I am not knocking some of kit's out there as I have not tested them.   So just making clear not knocking them just saying what has worked good for me.

At this point a lot of my ATX psu's I had laying around from previous gen miner's went to mining Ether.   I have had a decent variety of PSU's over the year's.  If you have the 205V+ it is the one I would go for.    If under the 205V then I would look at the EVGA Supernova 1600 you mention, as EVGA does have some great highend PSU's.