I too took your suggestions, Rally, with QO lol but dont blame you for anything. Actually the 4000's I got are just fine, as well as all the smaller ones too, they just wouldnt flow as much as I wanted. I tried the 6000's and 9000's and they were all to noisey. For the price of two 6000's (or slightly more) you can get a good external that blows them away, literally. Now I lean more toward the Sequence, Pan-World, Iwaki, Velocity lines. I am pretty happy with my Dart.