Well You have 2 free level 1 contacts that everyone gets. On top of that you have 276k left as well. Additional level 1 contacts are 5k, level 2 contacts(Buddies) are 10k, and level 3 contacts(Friend for life) are worth 200k.
I would suggest since you are the SOTA Street Sam you buy at least the following contacts, (if they fit your history that is)
-level 2- Armorer of some sort to supply you with weapons, ammo, etc.
-level 2- Fixer to set you up with other runners and possible jobs
-level 2- Street Doc to get you access to shadow clinics for cyberware implantation as well as maintenance on the cyber you already have
-level 2- Cybertech Guru to get you those SOTA (state of the art) goodies as well as a heads-up when new things are in development
-level 2- a techie to get you some electronics goodies, like higher rated maglock passkeys, and whatever other things that you as the electronically inclined member of the group might need.
I only bought you 1 month of middle lifestyle as I didn't know what her living conditions would be. So I would sink whatever is left after contacts into this, it is afterall the dream of all runners to make enough money to live out the rest of their life in luxury. Usually about 1 million nuyen (Permanent high lifestyle) or 10 million (Permanent Luxury life-style).
Lifestyle per month (100 months=permanent)
Luxury 100,000
High 10,000
Middle 5,000
Low 1,000
Squatter 100
Street 0