I have a pair of Mole-Richardson BIAX's and they are amazing. 4 tubes in each (in two banks that are switchable), they don't flicker, they don't put out much heat and they're dimmable too. Barndoors, eggcrates and filter scrims are easily installed or removed and I can use either daylight or tungsten balanced tubes. They consume 250 watts apiece at max output so there's plenty of light without much strain on the house's electrical system (or the power bill).
I have used KinoFlos as well but I'm not a fan. They have a separate ballast (makes for a system that requires proprietary power cabling) and are nearly 100% coroplast construction, very light, but very delicate.
I suppose one could construct a DIY rig, but I doubt they'd be as flexible or durable in the long run.