1-2 lbs per week is safe number. Diet will play an important role is reaching your goal. You're keeping yourself active and should consider weight training.
Everybody is different with caloric intake. I suggest u gradually decrease it and try for 1600-2500 cals a day.
Starting weight (1/21/10): 265 lbs
Current weight (4/15/11): 201 lbs
Lbs lost: -64 lbs
Goal #1: 200 lbs
Goal #2: 10% body fat
Goal #3: Complete Tough Mudder!