It would be cool to have the following stats:

Damage Per Second (DPS) for each tower at each level (obviously you have to account for multiple target hits, still useful)
Total cost for each type of tower at each level. For example Lvl 3 tower will be Initial Cost, + Lvl2 upgrade cost + Lvl 3 upgrade cost (at default prices only, should still give an idea of cost ratio at reduced prices)
What is the % of splash damage a rocket gives off to surrounding creeps
How much extra damage % a tower does once fully charged from the vortex
Total Cost/DPS for Each tower at each level to show the price per each unit of DPS for each tower at each level.