Thanks everyone for the constructive feedback.
TwitchyD: So far in my head it's not specific enough for a particular direction, and I generally open up the book from a pick-n-mix perspective. Historically I've had a specific role (like the ones in RC: fire support, matrix, magic, etc). But I already have a heavy mage for SR: Missions, and I find myself sitting back a lot so other people get a chance in the limelight. So while it's different from anything I've tried before, I want to focus on
That. I want a character who enhances the rest of the team, so "sitting back" is where my points are spent.
As far as mixing 'warez and wiz, it's never bothered me. It's all a tool-kit. If it helps me get to my destination, I don't mind cutting off an arm or two, foregoing it entirely to commune with the spirits, or using some combination.
Obviously TacNets are great for support. Similarly, a high Perception and Sensor suite (drone based) will let you use the Active Targeting rules by linking your sensors to a weapon and lay down extremely accurate supporting fire.
Many GMs will let you use the same rules for actively targeting with handheld sensors as well, letting you effectively play as a spotter for the group's street sams by linking your sensors to the street sams weapons and actively targeting.
Don't forget to consider a Buffy the Buffmaster mage build. Heal and health spells can provide very easy and cheap boosts to your allies, as can many illusions (especially if you have a mind for trickery).
Theoretically a INT based mage (for Perception) could easily hack (you never actually use the Log for your hacking roles), autonomous rig, actively target, run the teams TacNet, provide magical overwatch and buffs, and summon more allies all in one sitting. Think about it, 4-5 drones out, 3-4 bound spirits out, a TacNet of Awesome, a few sustaining foci for some buffing spells, and a couple simple actions for actively targeting a couple poor poor bastards. That's probably a little overboard though.
And of course you wouldn't technically have to cyber up to do any of that, but a point worth of ware would make life a lot simpler.
This is my favorite pack of suggestions so far.