List activity for all members (whether they have contributed or not)
How comfortable are you with Excel? If you do your contribution aggregate and check the box for Contact ID as a column and then export the results, and then also do an export of all your members and also include contact id, then you can use excel to merge the two lists based on contact id.

Also unless you need the relationship you can also look at Search - Custom Searches - Contribution Aggregate which should be the same thing just in a less spread out format which would make it easier to work with in excel.