Well bro, this varies a lot and there are as many opinions as people on this. In general though it depends a lot on your body type, how fast you generally are capable of building muscle and your metabolic speed. If you are training to build muscle, and by this I hope you are lifting intensely, 1 gram per pound of bodyweight is generally the accepted baseline. Although I know some guys that are definitely in that 1.5 to 1.8 grams per pound category. You will find it difficult to get the necessary amounts of protein at those levels without protein supplementation. I recommend that you check out Optimum Nutrition's Pro Complex, it has a great amino acid profile, it tastes great, disolves well, and has a mix of both fast and slow digesting protein that creates a sort of time release action of continuous protein release. Based on your profile weight you should be aiming for a a range of protein between 150 and 270 grams, and I seriously would consider being at the higher end of that instead of the lower.