I'm thinking the madcap shaman will be the better default shaman as cheaper, access to artefacts and can still double cast spells.
I'm currently working on my list which will be as follows.
Loonking 260pts
Loonboss on giant squig 110pts
Madcap shaman moppit 80pts
60 stabba, 9 nets, poking spears 360pts
6 squig herds 70pts
6 squig herds 70pts
15 squig hoppers 270pts
15 squig hoppers 270pts
15 boinggrot knights 300pts
5 sneaky smugglers 70pts
Squig stampede 90pts
1950pts