I'm my experience these are above average for players around level 100:
Weapons: Singularity Launchers
Energy: Singularity Cores
Armor: Nexus Armor
Defenses: Phase Shift Engines
Shields: Lets say mass shields are good for level 100 (Mostly useless until you get planetary shields)
Cloak: Mission rewards/ NPC drops/ Blue badge items make researched cloak unnecessary for most players at level 100
Scan: Whatever you need for scan blitzes; otherwise, same as cloak
Planetary Buildings: quantum assembly (+6 buildings) Not sure about this one
Base: Ssshhhh! Don't tell anyone, but I didn't bother with base research until I needed access to the collective theory lab
