I have dropped all but 5-10 lbs of the fat that I want to lose, how much/which type of protein should I be eating to make my exercise add slightly to my muscle mass?

I want to weigh around 140–145lb. and have lots of strength and a solid build. I don’t care if I have a six pack or perfectly toned arms. I just want to be optimally healthy.

I weigh between 148–150 right now. I am 5’6” just shy of 5’7”. I think I should start working on cardio exercise more, and adding protein to give my muscles something to grow and heal.

I try very hard to only eat natural, and I would only take natural protein supplements. Any recommendations would be much appreciated. I have my diet pretty well under control.