Something does not add up with your description:
1) The Savex L-39 is a 90mm size model
2) the DS-30 is a 69mm fan
Either you have a DS-30 (which won't fit the airframe) or you mis-spoke and you really have a 90mm DS-51? I'd guess by your motor description that you have a DS-51
Use this fan calc to refine your choice of batteries and expected power:
http://www.s4a.ch/eflight/fancalc_e.htm
Suggestion; don't go cheap on servos, use at least metal gear and enough torque.