Should i size should i go for my fake ?

I know that I want to get fake s. Its not so much that the I dont like the size of mine now its just that they are a bit lopsided and i figure that if i am going to fix them I might as well add a bit up top right? But anyways I am at a small D right now but am trying to decide it I want to go all the way to F or to DD. I am about 5-9 160 so i want them to look big but not disproportionate.