Usually, I'm the dwarf. I start off getting resurrection. Then the next round, or sometimes the one after, I get Smartlink, then after that I get the tree of life and put it where I had resurrection before. Then whenever I need to res someone I use resurrection from the assignment menu. On about the 4th round I finally invest in a new weapon besides the pistol, and usually get a shotgun.
Resurrection is a great way to rack up the cash to buy more things. I will change my strategy though as soon as I get the resurrector, the 100 pistol kills, the 100 smartlink kills, and the 100 shotgun kills achievements which shouldn't be long.