The subject of BMI comes up a lot here and is controversial.
ALL OTHER THINGS BEING THE SAME, it is "healthier" to carry 160 pounds than 200 pounds, even if the extra 40 pounds is muscle. Your heart has to work harder, your joints and muscles have to support more weight, etc.
However, all other things are never the same, and it's certainly better to be an in-shape, muscular 200 pounds than a lazy, cholesterol-ridden 160 pound smoker. So BMI is quite imperfect.
For example, purbeast0 indicates he is now just over 200 pounds at 5'11". I've seen his pictures, he's a very muscular person. I workout regularly and have a decent amount of muscle but not nearly to that extent, so while I'm the same height I am quite overweight at 200 pounds. I'm at 180 now and start to feel fat at >185 but feel (and look, according to my wife) a bit unhealthy at <175 pounds. A lot of the "you look unhealthy" comes from what you're used to though.