A dietitian at Unity Hospital put me on an 1800 calorie per day diet, which I found to be very easy to follow. It simply consisted of me eating a balanced diet consisting of a certain # of starches, Proteins, milk, vegetable, fruit and fat servings per meal (it was VERY easy to follow). I am 6' 4" with a large frame, so even though 1800 calories was right for me, it might not be the right # of calories for you. Nonetheless, I dropped 35 pounds prior to my surgery, whereas my surgeon wanted me to lose 25 pounds. The best part of this balanced diet was that it helped me to learn to eat much like I'll need to eat for the rest of my life.
I also eliminated liquids (except milk w/cereal) from my meals while on this diet, which unquestionably made me feel full faster (you'll have to do this after surgery, so consider this practice).
I'd also strongly urge you to exercise daily if you aren't already doing so. I began walking for about 40 to 60 minutes each and every morning, which quickly became habit. Now my dog won't let me miss a day, rain or shine!
Good luck!