Shopping for sperm?!?!

My wife and I are at the point of needing to shop for sperm. Ignoring the fact that it feels bizarre shopping for sperm, I feel totally at a loss for how to select which sperm to go with. Obviously we want to find someone who looks somewhat like my wife (I’m carrying) and we have some specifics from the doc, but beyond that does anyone have pointers on how to select sperm from a sperm bank? How did you choose?