at what point should i stop losing weight and start putting on muscle?

i m 19 5"10 204 lbs and losing weight quickly. i am in a good caloric deficit, but i am not STARVING myself at all. i have a really clean diet, i weigh all my stuff before i eat it and log it down count cals macros the who 9 yds. i m loosing the weight, but i eventually want to put on some MASS OF MUSCLE. my weight loss goal is 170lbs. do you think i should keep that goal so i can be kinda lean before i start lifting? or should i do it at 180 or what? lower weight or higher than 170 and why? i know in order to build muscle i m gonna have to put on some more fat and eat more... i just dont wanna look like the Pillsbury dough boy again lol.