We study the single field slow-roll inflation models that better agree with the available CMB and LSS data including the three years WMAP data: new inflation and hybrid inflation. We study these models as effective field theories in the Ginsburg-Landau context: a trinomial potential turns out to be a simple and well motivated model. The spectral index n_s of the adiabatic fluctuations, the ratio r of tensor to scalar fluctuations and the running index dn_s/dlnf k are studied in detail. We derive explicit formulas for n_s, r and dn_s/dlnf k and provide relevant plots. In new inflation, and for the chosen central value n_s=0.95, we predict 0.03