I mostly use natural light but sometimes that is not an option. Mostly because I'm still learning! I love my sb-800. But my budget is much smaller now. I need maybe one to two more speed lights to be able to take good portraits inside. I used a cactus radio trigger right now. I have looked at the strobist website and they talk about a brand but I'm still such a noob that I'm not sure they will work with what I have now. If I use my radio triggers which what I plan on doing what are some good flash units for a cheaper price that would work with what I have now. I have a D3100 so I don't have the commander mode on my camera so I know I have to use manual to shoot from unless I use my sb-800. Hopefully my question is clear. What is a good flash that would work with my set up I have now. I need them to be right at or under $100. I just don't want to buy something that is going to break after I pay for it.