Romani, I cannot believe this thread has disintegrated to talking about cables and in particular good old Audioquest which is present in alot of my Home AV entertainment system.
First let me respond to your original question of do I know any good 3.5mm to 3.5mm cables? Unfortunately not and I am unlikely to. Even with my D600s I did not purchase any upgrade cables because I ain't no mug no mo'.
Second is to dissuade you from this dangerous money-sucking / diminishing returns exercise, an article below (admittedly on speaker cables but the same principles apply to headphones on a smaller scale.)
http://stereos.about.com/od/optimizingperformance/ss/Do-Speaker-Cables-Make-a-Difference-The-Scientific-Perspective-Part-2.htm
I am the first one to admit that I was guilty of buying and hogging lots of cables because in case of WW3, I needed something to hang myself. I don't know why you potentailly desire to upgrade but in the past for me it was to see if I could improve the sound signature for both speakers (fck you Nordost, I want my money back and I am too lazy to sell sht on ebay) and headphones (crystal piccolino is a bit taylor swift i.e. a bit sht). And indeed I thought for a while that the sound quality was improving because I could hear things that perhaps before I couldn't. Most of these cables have the enemy which is silver (I have heard all sorts of reasons why silver is used... because it's a better conductor hence treble travels faster on them hence clarity BLAH BLAH BLAH BS BS BS). At the end of this pointless exercise I realised the following: coherence is lost, sound as I mentioned before is thinned out, frequency response changes are not significant at all (see article but also note that FR graphs do not tell the whole story) and you lose what Denon intended the sound sig to be like. If I see another high end cable review say the word "ethereal", I am going to eat some curry then fart into a ziplock bag and FEDEX it to the reviewer.
Lastly [COLOR=333333]I have alot of Audioquest interconnects etc... not because I think they give better sound quality or video quality (for the digital HDMI stuff). I use them because they have quite a good quality build. I used to have the higher end stuff like Carbon USB cables for linking up my DAC etc (WOW WOW WEE WOW 5% silver), I switched it all out to their lowest end range the Forest and Evergreen stuff (which has no or v little silver) because i found that with the higher end stuff, the sound got thinned out too much with the expensive stuff. If AQ 3.5mm cable fits the MM400, then I may go for the [/COLOR]Audioquest Evergreen Audio the cheapest one in their range I think. However, i would probably look elsewhere TBH because those plugs look massive and clumsy.