Hey everyone, Futureshop has a sale on memory and I need your advice as to which CompactFlash to buy? "Sony 4GB 133X CompactFlash Card For Alpha Digital SLR Cameras" for $59.99 or "SanDisk 8GB CompactFlash Ultra II Memory Card "for $79.99 I'm pretty new to dSLR cameras, I just bought a Canon 40D. Will I even notice the difference in speed? Should I pay the $20 more for a bigger but slower card or just buy the 4GB. Thanks in advance!