Did you get this figured out yet? If not, let me know and I can point you to some freebie software that will both resize the pics and reduce the dpi...additionally, you can rename the photos as needed and save them in a different folder on the computer.Worked just great; I wish I knew how you did that.
BTW...if you are shooting with a cannon (guessing b/c I've got a 50/50 shot since you said you're shooting with an 800$ body...it's either cannon or nikkon), this can be done with the Digital Photo Pro disc that came with your camera.