Using a ray tracing calculation, a number of different waves are simultaneously launched and followed as they generate a steady state tokamak MHD equilibrium via RF current drive. By adjusting the power, it is possible to create equilibria which in these calculations are in the first stability regime. The measure of global current drive efficiency, γ ∼ eR0I/PCD, is computed for a wide range of tokamak plasmas in steady state power balance to obtain a general scaling law which includes a dependence on temperature, Zeff and beta. On the basis of the general expression for γ, a series of reactor designs are created which illustrate the options available for optimizing steady state, first stability regime tokamaks; high temperature (i ⪆ e ≈ 20 keV) and large size (R0 = 7 m) appear desirable for maximum Q.