I'm thinking that if you go for a 1000-cal deficit, you'll go below your RMR (resting metabolic rate). That's not the best plan...
"When you cut calories to BELOW your RMR, your body fights back. Restricting calories below your RMR is like asking your car's engine to run on too little gas. If your car is sitting in the driveway with the engine on, it is burning gas as it sits there. If you put the car in drive and step on the gas, it burns gas at a faster rate. What happens if you choke off the supply of gas to your engine? It sputters and eventually stalls. The same is true for your metabolism."
That information comes from this site:
http://www.shapeup.org/atmstd/sud10v3/sud10s7.php
You'll find a lot more about it if you go there. They have calculators.
Shape Up America is a nonprofit organization founded by the former Surgeon General C. Everett Koop, M.D.
Good luck,
Jay