OK.. I am thinking about getting implants. I don't want anything huge.?

I had three kids so I am kinda saggy and i want to uplift them a little bit. My husband isn't too crazy about it because he is afraid that they will feel fake and that scars will show. I want to know if saline is better than silicone or vise versa.. or what the best placement is so that they feel more natural. And i also see that there are different ways to have them put in, what is the best way with minimal scarring?