Hmmmm -- I think I'd tend toward getting additional 500W lights -- unless of course you can get a 1000W that has a variable intensity switch on it. If you decide you only need 500W for an especially moody pic, you've got it. Or if you need to light from different angles you can with multiple lights. Or if you simply need a brightly lit scene, just plug in both of the lamps and train 'em on your subject.
If you just grab the 1000W, you limit what you can do. Does that make any sense?
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