Hooray, I finally was able to jailbreak both my SIM-less iPhone 2Gs using the assistance of this link:
http://www.ilikemyiphone.com/2010/02/10/jailbreak-activate-and-unlock-original-iphone-2g-3-1-3-firmware-using-redsn0w-windowsmac/
It was a pain, but worth it.