Sleater-Kinney as headliner would be perfect. Would also like any of Bas Jan, Peaches, Tune-yards, Yves Tumor, Gwenno, Gruff Rhys, Rosalie Cunningham, Lonelady and Kelis. Need St Vincent to come back soon for a hat-trick of solo headline performances.
Also Le Tigre are active again, but extremely unlikely to ever happen as UK Bikini Kill Roundhouse show cancelled after multiple postponements.
Pavement and Deerhoof would keep the other half more than happy.