Multiple default values for a table

Does anyone know of way that a user can have multiple default values for a table row based on another row in the table? I realize that if I create the default value using the create table command that I can only have one static value, but I would prefer a scenerio where I could have a list of values that could go in depending on other criteria. something like a column defined as a UDF type field but only for the insert, so that it is updateable.

thanks in advance!!!!

I'm not sure how you'd evaluate/decide which value to use with data that hasn't been written to the record yet. Wouldn't something like this be more suited to a stored procedure?