I respectfully disagree on the Spiral Dots. They are more comfortable (they usually are), but on the E5k I find they increase the bass so much it completely overpowers the mids/treble, making them even darker. The bass is already just to the line of bleeding for me, so the Spiral Dots just exacerbate this. The SpinFits are comfortable too, being a bit thinner and do give a more balanced sound overall, but I'm not sure I like how it slightly hollows out the wonderful mids, so I'm on the stock tips.
Just offering a differing opinion, this could all change as I continue to try various tips.