Don't harcap magic, especially on a cybered magician. Would you rather pay 25 bp now, or 25 karma later? Very few characters want to hardcap any stats; the only times it's worth it are people who are jacking their stats really high already (like 8+ softcap), and Technomancers always want to harcap Resonance.
Fetishes have to be linked to spells, and the spell doesn't work without the fetish. So, like, you would like Electricity Aura to a fetish, and you get +2 drain with Electricity Aura, but you can't cast it without the fetish. Generally, fetish spells that are high-drain and that you can live without temporarily, but don't fetish basic stuff you need to function.
Incidentally, you might want to consider a different element for your aura - either Sound, or Blast. The reason is:
Blast does damage that there's no elemental protection against; people often have Nonconductive armor, but there's no Blast equivalent.
Sound does Stun damage that ignores armor, and nauseates anyone who takes more boxes than Willpower.
Blast has the advantage of letting your adept buddy punch through tanks; Sound won't work on vehicles or drones but it will let him one-shot anyone he can hit.
Mindnet is a terrible piece of crap, and anyone who takes it is a Bad Person. You can send messages, images, and emotes! Just like... an ordinary commlink/simrig setup that everyone should be using anyways for Tacnets. And it does F/2+FIVE drain if you want it to have respectable range? And threshold = number of people in it? And everyone has to remain in range? And it costs a spell slot, and you have to sustain it?
