I did a search on flashes and the info is a little spread out and vague for what I'm trying to figure out. I'm looking at buying my first external flash and I've read up on equipment, so I have an idea of gear I am going to buy (umbrellas, stands, brackets, so forth) but I haven't quite wrapped my head around the difference between low end and high end flashes. I was reading about manual flashes like the SB24/SB26 etc and then more expensive flashes like SB600/900 etc. What is the main difference? What can the 600s do that the 24/26s can't do? I have a basic understanding of how flashes are used, but terms like commander and multiple flash setups start to confuse me. I need help!