Greetings. I'm in the midst of setting up a modest home studio. I got the 7D a few months ago, and am experimenting with the wireless flash control. I'm pleased with the results so far, but I want to add a second off camera flash in addition to my 580EX II. I don't really want to spend the money on a second 580. Any suggestions for a second flash for my wireless setup? I'm considering a used 420EX or 430EX. I'm not looking for super-cheap, but something under $200 that will get the job done for portraits.
Oh, and the lens i'll be using most of the time is the 17-55 2.8 EF-S.