What is a resonable goal to loose per week?

Being that I am roughly 262 would 4 lbs / Week be out of the question? I am browsed through a lot of posts, and people can achive this from what I have seen. I would like to stay rather strick w/the carbs so It would help me do this.
I wouldnt be so concerned w/how much I loose per week If I didnt have a really really really important physical in 5 months. I am doing my best to get cardio and lifting in 4-5 times /week as well as you can see in my journal (click on my signature if interested).

Thanks Guys...