I think you'd lose pretty quick on 1000, truly - when I manage to stick to 1200 I can lose 2lbs a week. And it is a plan where you can eat a good range of stuff, and not feel too deprived, which is good. I am very, very drawn to trying 810 but cannot get to CDC (or she to me) for supplies, and think that may be a good thing really... it gives me a chance to get steady again, to get some stability after weeks of eating in just the way you describe. And yes, it makes you feel rubbish... but once you find a 'safe' zone, which 1200 can be for me, you feel SO much better. (Says she who is struggling to find that zone). And a part of me fears I could not do 810 again, or at least not for very long. I almost think our bodies are wise to it and try to scupper our best intentions. (OK, it's probably leptin, but you know what I mean.)
Hugs Sunshine. Whichever plan you choose, you will find your zone and achieve what you want to... believe it, because I certainly do.
xxx