I need good quality digital voice recorders with the best prices for long term business. Approx order of 1000sets / month.  The product must have the following qualities:  A) Good recording clarity B) Good Playback sound with no or very little humming and background noise.  C) Memory card slot.  D) At least 50 hours recording time.  E) UBS Port for computer connection F) LCS display with light G) Preferably with MP3 H) Best prices possible.  I) Approx 1000sets / month Regards,  LINGAM