Tried a few. This was the best.

I’m picky about how these buttons work and about how well they align. I needed to be able to choose what buttons I wanted to display, how they look (counts, etc.), how they align with each other, and whether or not

• choose what buttons I wanted to display
• choose the format of each individually
• fix the alignment with each other if required
• choose whether they display at the top or bottom or both

I’d already tried WordPress’s own (Sharedaddy) which has no option to display at the top as well as the bottom of a post. I’d also tried AddThis which is basically broken (option to choose the buttons you display doesn’t work).
Finally I cane across this one and it works perfectly and is really comprehensive. Nice work.