guess that the above posts i mostly agree with. as thal said, it would be hard for a guy who was in the military and exposed to something hazardous or whatever and was either ' shooting blanks' (as he put it

) or had the potential to have a severely handicapped child. i really don't know the answer to that question. maybe, as with all sin, there is lesser sin and people that choose sperm donation for that reason are not held as guilty as others. abraham almost gave up and then took sarah's handmaid since sarah requested it. guess that is sort of similar.
but, as a general rule - i don't think sperm donation is good for healthy people - even if they think they can choose healthy eggs or sperm and have 'perfect children.' all you have to do is look at a few generations of whomever you are thinking of marrying. also, there are features of extra healthy people that you may better be able to prove by looking at the real person (female or male). models are chosen for good skin (internal organs probably working well), symmetry of body, and obviously their features. not saying that guys should only consider beauty - but what about lifestyle. a really beautiful woman would #1 take care of herself so that she continues to be healthy (non-smoker, careful with diet, drinks water/exercies, isn't a drunk or druggie). same with men. they wouldn't be partying a lot - and probably the healthier spermed guys would be athletic. to me i'd just look for someone who likes to get out and do things and doesn't sit home always on the couch.
meeting the family, sibilings, cousins - you could get a pretty good idea of not only genetics but what the family is about. say you have really good genetics and a messed up family. the genetics are only a small portion of life. there are many people who are handicapped that are more disciplined in life than some who are not and seems that there are many healthy slackers. i went to help a woman who was handicapped to clean her house - and was literally shocked at how clean it was already. i've been to other's homes who are perfectly healthy and just 'don't like to clean.' of course, my home isn't always spotless either - but with kids around it's clean one day and messed up again the next. anyway - i'd look for a lot of things besides sperm/egg.
this makes me think of one man i knew who's wife came down with a debilitating illness that caused her to be wheelchair bound. they struggled with the disease - and yet all her children were healthy. they learned to give and to take care of their mother. all the boys are really responsible and probably more tolerant and caring for those who are not 'perfect.' also, the husband, instead of leaving his wife for a younger woman, stuck right by her side and became closer to her every day. always attending her needs and things. she actually got better (though she has bad days) and last time i saw her was walking around a bit. also, her love for her husband is really strong and it makes me think that love isn't perfection - but knowing how to live with imperfection and still love deeply.