I just got the Kingmax Platinum SD card in the mail yesterday and its quite simply the best SD card I've ever used, period. I used to have a Lexar 128mb but this is actually WAY faster than it when it comes to reading and writing photos on my Canon and transferring them on my computer. It clocks out at a maximum of 10mb per second which compared to the 3-4mbps that a regular Lexar card would give you makes for a noticeable difference when you have a newer digital camera.
Best of all, its only $23.50 at Newegg.com
Read the reviews. Its the highest rated SD card in the entire website.
http://www.newegg.com/app/ViewProductDesc....-155-256&depa=0
If anybody can show me a better rated card with a comparable or better price, well, I'd love to see that.