I don't do a ton of off-camera lighting, but I seem to be booking more and more portrait sessions and I'd love to start using it a bit more. I currently have a 60" Westcott Umbrella http://www.bhphotovideo.com/images/largeimages/197057.jpg I have an SB600 and an SB800 (two Nikon speedlights). I've got 2 pocket wizards, so I need to buy 1 more in order to fire the SB600, but from what I can see, the SB600 doesn't have a sync cord input? I'd like to pick up maybe another umbrella or one of those Parabolic Light Modifiers (PLM) that everyone seems to really like. I don't normally ask such broad questions, but can some of you guys give me feedback on what should come next? Normally I can do just fine with my 60" umbrella, but I know my shots would improve if I learned a little more and had some more modifiers. Thoughts? Suggestions?