120mm? basically SP type of fans.
For looks, Corsair SP 120 Ring fans are nice.
Can also go for CM FP Silencio.
Both are low noise. Can also consider noctua but the brown color may look off for some.
Noctua fans have good stats (CFM, static pressure, noise), but their prices are correspondingly high. And yeah, their brown is a bit ugly. Otherwise, I'm more than ok with usual plain black, white, grey kind of colours, or simply clear (LEDs are in fact a very slight negative for me or non issue on some days.)
Where to find this CM FP Silencio and how much? Blademasters are sleeve bearing (not mounting them for vertical airflow, so it shouldn't be so big of a problem) and reasonably cheap at SLS.