Syndicate

- You're definitely going to want the flamethrower when it comes up (pretty much incapacitates for half a minute), as well as the long range sniper rifle, the minigun, the uzi, the energy shield and the chest upgrades. You can probably guess at what to research from the description of those items...

- Most of the time you don't need more than one agent and you can save money that way, outfitting all four is expensive.