For years, I've been using whatever manual flashes I could get and triggering with a few pocket wizards. I even have the PocketWizard module in my Sekonic L-358 meter and use that to trigger the lighting to get readings. Works like a charm for film or digital. In your situation I would do that, then you could get cheap flashes, like those YongNuo flashes ($70 each on Amazon), and pick up however many PocketWizards you need (I have four) and the Sekonic with that module. I just think having that kind of control is more fun than letting the TTL stuff do its thing. Then you can modify however you want and it all fits in a small bag.
Have you ever visited the Strobist blog? Go there and check it out. TTL is for the birds