After playing around with the small included 16mb card and my S2, I am ready to use the 1g that DH picked up. Just noticed it is not the SanDisk Ultra...just the regular SanDisk SD 1g. Is this card sufficient? Not planning on doing video right now...just photos. Have been reading about memory card error and was concerned. Just want to make sure we have the right card. When I insert it should I format it into the camera? All advice appreciated!