OK that's all I needed to know.
I'm still concidering picking up a pair of S400 due to the unbeatable price even if I'm a very satisfied M-Audio Q40 user which has a bassresponse which is just spot-on for my needs. Exactly how bassy would you put these headphones, like are they slightly bass emphasized such as V-Moda M80 or ATH-M50 which has about 5dB boost in bass or are they even bassier? The Q40 measures around 8dB or so boost which is perfect for my needs (well ~9dB is perfect for me, thereabouts Ultrasone PRO900, Q40), let's say in-between a M50/M80 and sony XB series bass quantity is what I'm looking for but I also need somewhat balanced midbass vs subbass presence, about equal of both. Q40 provides me this but I'd gladly try another headphone as I've been using Q40 for a while now.
The genre I'm a fan of uses a wide range of bass frequencies and won't sound right if it's skewed either towards subbass (too little punch/impact, XB700, DT770 Pro etc) or midbass (too little rumble, eardrum vibration sensation, HP700, HTF600, D1100).