Well don't hold me to this issue is pretty much a take it or leave on a new Boeing with a few exceptions. Examples for a new B777 might be as follows;
EFB Yes or No It's included in all future 777/787 deliveries but the questions is, how has it been configured and set up for utilization?
Radar Honeywell or Rockwell Collins
Most if not all the other VHF/HF/SATCOM/Xpndr, would typically be Honeywell or Collins
There are a host of options for the B777 FMS/ND/PFD indications and each airline picks from this list for their own configuration.
I recently saw a B777-200ER that seventy-two change orders for their particular configuration. Many of which were avionic tweaks over and above the standard Boeing configuration.
Obviously when you get to the cabin, galleys and IFE virtually anything is possible.