Donor Selection

Boy, this has got to be the most difficult purchase decision I have ever made. And I have 4 days to do it...

I first have to select a provider...The two that REI often works with are:
http://www.fairfaxcryobank.com/
http://www.cryobank.com/

But how does one select a sperm donor??? How much of what makes the donor is hereditary? Their artistic talent? Their hobbies?

And I need to decide by Monday...