I took some time to get the values for "rush".
Sunkens/spores count as 2 units

0 = Barracks OR Spawning Pool OR Gateway (includes incomplete)
1 = At Least 17 Marines + Bunkers, OR at least 16 Sunken Colonies + Hydralisks, OR at least 7 Zealots
2 = At least 25 Marines + Bunkers, OR At least 11 Mutalisks + Spore Colonies + Hydralisks
3 = At least 6 Marines + Bunkers, OR At least 3 Sunken Colonies + Hydralisks, OR Hydralisk Den?, OR at least 2 Zealots
4 = At least 17 Marines + Bunkers, OR At least 16 Sunken Colonies + Hydralisks, OR at least 9 Zealots
5 = At least 7 Marines + Bunkers, OR at least 7 Sunken Colonies + Hydralisks, OR at least 4 Zealots
6 = At least 13 Marines + Bunkers, OR at least 2 Sunken Colonies, OR at least 2 Dragoons
7 = ?? Siege Tank, OR ?? Queen, OR at most 5 Zealots.
8 = At least 6 Marines + Bunkers, OR at least 3 Sunken Colonies + Hydralisks, OR at least 2 Zealots
9 = At least 10 Marines + Bunkers, OR at least 5 sunken colonies + Hydralisks, OR at least 6 Zealots
10= At least 5 Marines + Bunkers, OR at least 5 Sunken Colonies + Hydralisks, OR at least 3 Zealots
11= At least 10 Marines + Bunkers, OR at least 10 Sunken Colonies + Hydralisks, OR at least 6 Zealots
12= At Least 17 Marines + Bunkers, OR at least 6 Mutalisks + Spore Colonies + Hydralisks, OR at least 3 Dragoons + Scouts
13= At least 25 Marines + Bunkers, OR at least 11 Mutalisks + Spore Colonies + Hydralisks, OR at least 8 Dragoons + Scouts