Run Faster has alternative generation methods.
Sum-to-Ten gives more flexibility, but a cybered mage is still going to have a high opportunity cost, since you will need higher resources to get augmented, then lose points of Magic
from those augmentations.
Point Buy (the equivalent of SR4 Karmagen) only gives you 800 points, so being a mage with high Resources will really cost.
Life Modules usually comes out technically ahead of Point Buy, but only because you end up with a lot of extraneous skills that don't quite fit your focus. It is even worse than Point Buy if you have a concept that costs a lot to execute.
Generalists are doable, if you don't spread them too thin, if you use gear/augmentations/magic to boost your dice pools, and if you have a cohesive concept to tie your skills together. If you have a lot of dice pools in the 12+ range, you are probably okay, but if you are stuck in the single digits, it might be a good idea to focus more. Something like B: Magic, B: Attributes, C: Resources (it sounds like you are gravitating towards cheaper augmentations), C: Skills, and E: Metatype/Human (1) - using Sum-to-Ten - might work.