EVGA B3 - a new series, starting at 450W (easily enough for one CPU + one VGA), also semi-fanless, Bronze, should be cheaper than Corsairs
Basically untested, a Leadex-based design but with cut corners (cabling, for instance) over the B2, and with increased power density: I mean, it's not a safe bet.
Bitfenix Whisper - also great PSUs, the fan is always on BUT spins @ 400 RPM (super slow for a PSU) up to around 350W (depending on the model and case etc.) - so effectively silent, no way to hear it; comparable to RMX and B3 series in other aspects
Well, no, it's comparable to RMx, but they're both a bit better than B3s.
But please take note, the fan MIGHT be an unknown variable, despite the good-looking fan profile (it's something I am considering these days): just to say, Corsair rejected any Martech fan because they were unable to cope to requirements/quality controls (they said me those were pure shit).
Seasonic Prime - they have a new Gold series, excellent PSUs with a price to match (they started with Platinum and Titanium - gotta sell a kidney to buy one, but sooo worth it)
Basically untested ATM, and very expensive (I mean, I don't think you might buy them in EU for 100 euros).
BQ - yeah, their top series are good, but v expensive; and if you go for their cheaper units - cheaper, but not so great, really - with so many other great (and cheaper) PSUs - not a good call
OTOH they are quiet, even the lower grade ones.
EDIT - if you don't go SLI/CF, you only really need 550W tops
It mostly depends of CPU overclocking and intended use: a 550W good PSU (like the RMx) will fit the bill of a gaming rig (so that the Ryzen 1700, even at 3.9-4.0GHz, is not heavily taxed) with a pair of GTX 1070.