I have a Canon SD1000, 7.1 Megapixel camera. I am going to take regular every day pics and record 1-3 min videos every one in a while. I just want to buy the cheapest SD card that I can buy. Does the speed of the card really make a difference for what I want out of my camera? Can I just buy the base Sandisk card, without all the Ultra or Ultra II stuff and will that do the job. Any input will be appreciated. Thanks.