There is - it's called "SFX", try googling for "SFX power supply" and you'll see that there's a lot available. There's a couple of reviews available, like
hardware.info and the info given at
Toms Hardware is pretty comprehensive.
Not sure about the "silent" bit - because of the size of these PSU's they have to use smaller (and therefore faster spinning to move the same CFM) 80mm fans. Even so, it's possible to get sub 30dB units - which I know isn't strictly speaking silent, but it ain't no jumbo jet either!
. As to "efficient", 80PlusGold units are available - e.g.
Silverstone ST45SF-G, and that one's modular to boot - so efficient AND tidy too. Only downside of that particular unit is that it's a bit "rock 'n' roll" on the noise side - the fact that the spec page only quotes
minimum noise level is always worrying. The Hardware.Info article
quotes that supply with a tested noise level of 45dB ... time to reach for the ear protection?