Aiming for 200lbs and then deciding if that works seems perfectly reasonable to me. Build makes a huge difference, both bone structure and muscle mass. I know that 166lbs at 6' sounds quite light to me (that's only 16lb more than I weigh as a woman at 5'8"!) but it might be absolutely perfect for some guys depending on build and muscularity. I think you'll have a better idea when you get to 200lbs--at that point you can assess whether you want to weigh less, maintain that weight but lean out, or maybe try to put on more muscle mass.
I think we get an idea in our head of what we "should" weigh--especially common for women, but I think men experience it too although sometimes in different ways (often relating to how muscular they should be). Aiming for a goal along the way and re-evaluating seems healthier than aiming for an idealized number that might not reflect what healthy looks like for you, whether that's higher or lower than the target.
[QUOTE=Leida;1006956]For 2 inches, you will need about 10-15 lbs, if the fat goes from the waist right now. If it sits stubborn there, it is impossible to predict.[/QUOTE]
That sounds about right for me hitting the 200lb mark, there isn't many other places there is a lot of fat anywhere apart from round the middle now :D
My dad is 6'2" and 175lbs, he's been that same weight since college and he looks pretty skinny. Not buff/strong, and not a string bean either, just a normal healthly looking guy in his 50's. On the other hand I am the same height and body type as you, and at 18 years old, 195lbs, I was sub 10% body fat while working out 20 hours a week and eating like a horse. I looked pretty good and I don't mind tooting my own horn about it. Now I'm at 200lbs and comfortable. I could stand to lose another 10lbs to get the definition really showing, but where I'm at I'm in better shape than 90% of the people I see, and that's good enough for me. I figure if I want to change body comp I'll do it by doing heavier deads & squats, move those lbs from my gut to my ass in a good way.
Depending on your fitness level 200lbs is a good target, but you may want to re-adjust based on how much muscle mass you actually have. Having gone from 230 back to 200, I was suprised how much flab was still there. Good luck and keep it up!
Check out Matt Fitzgerald's book "racing weight", i find his calculation method to be sound.