If it were me I feel like I'd go with more necromancer/geomancer.
Warfare/geomancer
Marksman/geomancer
Necromancer/Aerothurge
Summoner/necromancer
I'm not really sure about the last guy though. You'd probably want blood rain on both necros anyways to put out fires and create surfaces for your necros to use or your aerothurge to electrify.
