What ScanDisk card to buy????

[jvan]

Hello, I have just purchased the Nikon 7900 and need to buy a SD card. I had an older Sony digital camera which took a memory stick so I am not familiar with the SD cards (AT ALL). When I went to get one my head started spinning, there is sereral different brands and different SD cards such as ultra, ultra II, high speed and so on. What does all that mean? And does the brand matter? There was everything from a Kodak to a Lexar and plenty in between. Does the picture quality have anything to do with what brand or type card you have? Will the type card you use make the wait in between taking pictures any faster? So what will work best with the Nikon 7900? PLEASE HELP!
Thank you in advance, jvan