I don't think anyone mentioned the new compact fluorescent continuous lights. They are bright without being hot. Many kits come with softboxes and large reflectors. They are priced inexpensively for the most part, especially those from China.
Probably not good for color but should be great for B&W. A lot of wetplaters are using them now.
Another option would be high output fluorescent tube fixtures sold by horticultural suppliers for growing, uhh, tomatoes indoors. (Similar tube fixtures marketed for photography are much more expensive.) I just put together a rig that holds 16-54w T5 48" HO fluorescent tubes. (Quantum T5 "Bad Boy.") Filled with 6500K 54w high output lamps at 93.5 lumens/watt, it would kick out over 80,000 lumens and still be cool.