preamp upgrade help;

HI,guys Im currently have a VTL 5.5 witch is a good preamp,but Im looking for a more organic sound with better midrange extention, Im considering the joule electra 150MK11, is this the right move,and how do you compare this two? my sistem consist of belles ref 350 amp,Kora hermes DAC,sonic fontier transport,and von vr4 speakers,puris audio cables; thanks,regards:
If you know any good modifiers you might have them go through your preamp and replace current parts with higher quality ones. Even expensive components seldom use best quality parts. Putting in better parts (caps, resistors etc) can make a difference you would not believe.