Memory Card Selection for the camera

Here thee is a lot of memory card specifications in size and speed or class.
I would like to point out a couple of points about it.
SDHC cards are coming as Class 2 to Class 6. Its speed is according to the class. eg. Class 2 is 2mb/sec, class 6 is 6mb/sec. Anyway SD cards have more speed compared to SDHC.

When it comes to memory cards, bigger is not always better. Please
keep in mind that if you choose to purchase a very large card, and that card is subsequently lost, corrupted, or damaged, you will have lost a great deal of memory and many, many images. Extremely high-capacity cards are most often used by professional photographers who shoot several hundred (or even several thousand) images in a single session. They are not
necessarily the best choice for the average digital camera owner. You
may wish to consider investing in several smaller cards. If one of the
cards is lost or damaged, you will have other cards to use. Another
fact to consider is that as larger cards are introduced, the cost of
smaller cards usually decreases. Of course, you may use whatever card you wish; the above information is provided so that you can make an informed decision.