I think he's probably referring to the Evercool series. Yeah those are a decent choice too.
If it's a rear case fan with no obstructions like fan filters or grills, you can use any 120mm fan that spins around 800-1200rpm. Should be quiet and move enough air for most needs.

For intake fan that might have a restrictive fan filter tho, more fan blades + a thicker frame would be better. (eg. the Silverstone that is 32mm thick with 9 blades)

Yeah Silverstone fans are bloody pricey, but it's not so bad when you consider the free fan controller. It's terribly noisy at full speed ~2400rpm tho.

Someone here on the forum had a bulk for Evercool Ever Green fans too. They look decidedly gay, but they're only 800rpm which means very nice and quiet.

My own experience? The CM UV/LED Silent series are really quiet and good. Summore only RM20 each, cannot beat the value there. I'd love to try the Nexus and Yate Loons and Scythe S-Flex fans, but those aren't anywhere near available here.