I hate implants,small are better than fake but i see you also like tattoos/piercings which I also hate I prefer a natural woman no matter what that means.Try to overcome your body issues I think you are perfect the way you are.And 1 more thing you mentioned stretch marks,if you do get the implants you will get more stretch marks on your breasts.
Keep in mind it isnt always one surgery, I had to have 5 so far and one more due to complications. If you arent financially secure, I'd wait until you are, incase you have all the wonderful troubles I did. At one point I only had one boob, what fun.