I'm still on the fence about upgrading to the D2X from my D70. Can someone explain to me how the D2X fires flashes wirelessly without having an onboard flash. Right now I use the pop-up flash on the D70 in commander mode to fire off camera SB600. Will I require an on camera flash with the D2X to fire off camera flashes wirelessly? If so, I guess I will need to add the $300 cost of an SB800 to the $4500 cost of the D2X!