Flash, Flash, Flash

We began discussing flash photography today in photojournalism class.  There is so much to learn about what type of flash to purchase and even knowing how to make the use of the flash that is purchased.  Below is some valuable information that I found on DIY Photography.

Nikon SB900 - The king of flashes - the most powerful strobe I know, with a completely tillable and swivel-able 200mm zoom head. Also featuring easy access for CLS menu, thermal control and 200mm zoom. 
Canon 580EX II - Featuring Canon's regular goodies + can control other flashes + has an external pc-sync outlet. 
LumoPro 160 - A good solid manual flash without all the bells & whistles of iTTL or CLS that the big names have. It will sync via pc-sync, 3.5mm jack and optical slave. 
Nikon SB600 - a small brother to the SB900. Not as big and powerful, yet great as a low cost strobe for manual/CLS work indoors.