Good news! I have received my Musical Fidelity X-can V8P, one of the last ones to obtain here, it seems that the importer can't obtain them anymore.
So I was very lucky to get one, yes, yes!
I hear it is a great improvement, more stereo-image and the treble/'higher' tones are less distorted it seems! So a good improvement and that even on a regarded 'non-highend headphone' as the Senheiser SR120!
I do like the sound better, so I will wait with buying an AKG K702 because the treble is less distorted and the SR120 seems okay in my eyes (and with wireless I can walk around the house in the meantime).
I use the line-option because via USB the sound seems less audiophile (stereo-image seems a tiny less and treble is less sparkling).
I have a MSI X58 Platinum motherbord with a very good realtek chipset, so I can do without a DAC.
But priority nr.1 will be saving money for a litle Pinkie V3i.