I've been using Etymotic's ER6i for a while, and I love them, but the wiring is getting stiff and the sound is cutting in and out. I was planning on getting the hf5 to replace them, but there seems to be a ton of hype over the Sennheiser CX300/500. Compared to the nearly surgically precise sound of Etymotic's products, how do the Sennheiser products compare in terms of audio signature, soundstage, microphonics, etc? I understand that they won't be reference quality like the ER-4 series, but are they a suitable (and most importantly, cheaper) alternative? Obviously, a drop in price does not necessarily correlate to a drop in quality, but hopefully, this is not the case. I noticed that Sennheiser's website states that they have 'bass-driven' sound. Anyone familiar with Etys knows that they have quick, punchy bass. Is the bass on the CX series booming, muddy, or what? I just wanted to know some of these things from people who have used the Sennheiser products.