Personally, I am 5'8 and my goal is 147 - 150. I still have several lbs to lose before I get there, but that was the weight that I use to be and I looked really good then.
This time, I workout alot more than I use to with weights, so that may be a little low nowadays. I guess I will just have to see how I look and feel as I get closer. At 5'7, depending if you want to be skinny or slim and your bodyfat percentage is, you would probably look nice somewhere between 140 - 150. IMHO Heck for all I know, you could look perfect now.