During weightloss, I stayed in the 600-800 calorie per day range, 70-80g protein, 80-100oz water.That worked for me quite well, and it seems to be the 'optimal' range for most VSGers.
Your maintenance level for calories is goign to depend on a number of things.
-- Activity level
-- Body composition (lean vs. fat)
-- Size (i.e., being 5'3" vs. 6")
_ Gender
-- Age
-- Genetics
-- Vitamin/mineral deficiencies
-- Hormone balance
If you've done a lot of yo-yo dieting, you may have disturbed your metabolism. Weight loss, alone, will slow your metabolism as will losing lean weight rather than fat. The best way to combat that is exercise including resistance training. Making sure you get adequate nutrition makes a difference, as well. Iron deficiency, for example, slows your metabolism through several mechanisms.
I am moving into 'maintenance" eating 1100-1200 calories a day and still losing. I also exercise a good bit. I've also had metabolic testing. My 'maintenance' level for calories is close to 2,000 per day. That's at 5'3" and 44.
(32 lbs lost Pre-op) HW: 291, SW: 259, GW: 121
Month 1: 21.9, Month 2: 12.5, Month 3: 12.8, Month 4: 11.2, Month 5: 11.4, Month 6: 9.2, Month 7: 11.2, Month 8: 10.6, Month 9: 7.6, Month 10: 6, Month 11: 7.4, Month 12: 4.6