Yes, Eheim and Tunze are the ones that quiet if not silent.
I was using MAG Drive pumps for a long time with no problem but now i use Eheim because its silent and reliable.
But there are water blaster pumps out now with design similar to Red Dragon for a lot less $. I have never had one though.
http://www.aquacave.com/Water-Blaste...ump-P3432.aspx
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Water Blaster HY 12,500 Circulating Water Pump.
Our new Water Blaster pumps are based off the same design as the Bubble Blaster pumps but intended for water circulation. These pumps feature a digital control circuit board inside that controls directional start up and RPM speeds. This smart circuit board will shut the pump off if it detects a problem.
Something never seen before on internal or external pumps is the Silicone Nitride shafts and bearings that we use. The benefit of this material is that it will not allow calcium to adhere to it like ceramic. This means less maintenance and cleaning and more time for you to enjoy your aquarium instead of working on it!
With the performance of these pumps and a 3-year warranty how can you go wrong. We offer several different models for water flow and head pressures. Check out our complete line for a circulation pump that fits your needs. You can also download the Blaster pump poster below here.
Specifications:
* HY12,500W
* Dimensions: 9.3″x5.1″x9.1″
*
Watts: 175 watts
* 95% efficiency
*
Max Flow=3,250gph
*
Max Head= 18.5 ft
* Inlet: 1.25" / Outlet: 1"
Eheim looks good as well with adjustable flow (neat feature if you intend to use it)
Eheim Compact+ Pump 5000
http://www.jlaquatics.com/phpstore/s...t_ID=em-pc5000
Specifications:
Flow Rate: 660GPH (2500 LPH) -
1320GPH (5000 LPH)
Energy Consumption: 82 Watts
Maximum Head: 9.5 Feet
Outlet Size: 1"
EHEIM compact: As the name suggests, small dimensions together with high power and many different uses are the most important criteria of this pump series.
3 models with maximum powers of 300 - 600 - 1000 liters/hour cover many application areas. The capacity of all 3 models is adjustable. The priming screen protects the pump and aquarium inhabitants from damage