Well...you could always go for the industrial series from Noctua but truly...they are called industrial for a reason. Unless you want your rig to sound like a jumbo jet on takeoff, I'd pass on it. If money's not a problem, just get a bigger case, and a larger number of fans. That way you can increase both intake and exhaust, but keep the fans on relatively low rpm, thus having both good cooling and relative quiet. Same would apply if you get liquid cooling as fans are also included.