Aerocool fans on a heatsink? I've never used them so I can't compare, but it seems like with their fin design they wouldn't be very efficient at pushing air through any kind of restriction (ie: heatsink fins). Like I said I've never used them, but they seem kinda gimmicky.
To the OP: I'm more inclined to use normal black fans and then use cathodes and leds for "accent" lighting since there aren't really any LED fans that are really high quality, but if you really don't care about noise you could always pick up an Antec fan or a Thermaltake Thunderblade. Mind you I'm pretty sure they're sleeve bearing and they're not quiet, but you could do alot worse.
The Thunderblade on my backup system is about as loud as every fan (note: 10 or 11 fans) in my primary machine turned to ~7v.