...hd video on it? I just bought a Canon PowerShot SX130IS 12.1 MP Digital Camera with 12x Wide Angle Optical Image Stabilized Zoom. It has the ability to shoot 720p HD video. I think I will be shooting a lot of video. Should I get the 32GB SDHC card for $54 or go for the 16GB card for $29? How much video/pictures can each card hold?