EL-wire sounds really awesome, and it looks really awesome, but holy hell, is it totally not awesome to work with, and expensive if you want to get quality EL-wire that won't die upon getting bent slightly. I feel like LED lighting is really the way to go, despite it's inability to make cool "outlines" on clothing, so to speak. I use EL-wire on my custom stuff that I wear to regionals, but I don't think I'll be bringing any back to the Playa, at least, not for awhile.
There are multiple "plug-n-play" kits out there. Coolneon lets you order them in lengths of up to 20 feet. Read up on their drivers and wires, and they'll have it for sale under the "instant gratification" tab. There's also the Amazon choice, where you can get 40 feet of separate 10ft lengths for various amazing prices... but only about 50% of those seem to survive the Playa, and 25% of them turn into a weird garbled half-lit mess because they get bent or because magic. Who the fuck knows.
Meanwhile, the chinese LED battery-powered lights I've had have lasted me two burns and multiple regionals/events, and now reside on my commuter bike that runs through the rain, dirt, and all sorts of adverse default conditions. And they don't eat up batteries like a motherfucker.