Anyway -- let's resolve a point of contention.
People prefer low-decibel fans because they are "noiseless". Unfortunately, there are limitations to fan design such that the simple aerodynamics of the fan idea means that you either sacrifice cooling through a more "quiet" design, or you increase noise for the sake of cooling with higher rpms and throughput. There are two categories of this noise: air-turbulence -- which can be partially muffled inside a closed case enclosure, and motor noise and vibration -- generally consisting of a "tone", "whine", "moan". As to the vibration of the motor transmitted through the fan frame, the rubber grommets resolve that considerably.
You get more effective cooling with greater CFM's. Greater air-pressure means greater air density which means greater heat-capacity and heat-removal potential. That also explains why cases and fan deployments which create a case "vacuum" do not cool effectively. Such cases and fan deployments generally result in a higher case-interior ambient and a degraded "case-design" cooling profile.
To provide greater CFM's, there is some limited potential for improving fin-design, vents, and other features, but it ultimately boils down to rpm's. Fans of the same size may vary across a range of CFM performance, but they ultimately fall into classes or categories of fans with a narrow range of CFM performance -- each class corresponding to size and maximum rpms for that size. That leaves the matter of decibel-level. Not a lot can be done when increasing CFM throughput to reducing "air-turbulence" and "white-noise", so the only thing left to do is to eliminate motor noise.
Finally, the remaining consideration is "longevity". You can't test your new fan for 50,000 hours, so you rely in the manufacturer's tests and specifications. Generally, if the warranty is "3-year" to "lifetime" -- the manufacturer has high confidence in his product. I think that Vantec Tornado has a 100,000 hour MTBV rating, so that's worth something.
Everyone has their approach to cooling. I prefer to focus on cooling as a top priority and noise as a second priority. I see many computer builds in these forums and other forums where the idle temperature for a processor like mine is between 36 and 40C, and load temps are as high as the low-50's, and these configurations are deemed "successful" and triumphant by the enthusiast who created them. My idle values at a 20% over-clock are around 27C at a room-ambient of 23C or 73F. My load temperatures never -- NEVER -- exceed 38 or 40C -- they seldom exceed 99F.
It's all a matter of personal preferences and trade-offs. But eventually, you have to decide whether you are going to live with a machine that is virtually noiseless with a load CPU temperature of 55C, or if you will be happier with a machine with load values under 40 or 45C, and some noise. If you can deaden the noise, so much the better. If you need complete quiet, you can take solace in the fact that both Intel and AMD thermal limits are above 55C.
Some may recall the Zalman TNN500 (I think that's the model number) -- their all-aluminum, black, $1,000 computer case that uses heat-pipes attached to motherboard components and hard drives to turn the case-panels into a heatsink. I'm surprised that nobody has tried marketing CPU and VGA cooler kits that go beyond the simple heatpipe design and use heatpipes to transfer the heat to any case -- be it steel, aluminum, flimsy, solid, old, new, ugly or "trick". Maybe the reason no-one has done that is that each case requires a custom solution and kit-manufacturing costs would be prohibitive.
But -- hey -- I'm retired, and the components I've acquired keep building up in the closet. I just might try it myself . . . .