I have owned in the past Cowon J3,ipod touch 4g,Clip,Fuze+ and if anyone can consider my opinion.
For neutral sound Sandisk is best(flat equalizer).
For someone who likes audio enhancements Cowon is the way to go.I watched full movie Prince Of Persia because of excellent sound that was produced with Hippo VB.
Ipod I do not know but I was really disappointed because no custom equalizer and flat response with Koss KSC-75 was not satisfactory.I did installed Equ but I felt the sound is not natural(My opinion).
I have got Sony and will share my opinion soon.
At the end of the day its personal choice whether one likes pure music or music colored with sound enhancements.
I personally prefer full spectrum response.
BTW: Fuze is indeed discontinued and considering that there were suddenly plenty of units in USA(without retail packing) and tagged as clearance stock,that may suggest that Sandisk is getting rid of Fuze stock.