Though I have never read anything bad about the at-2020 I would not choose it for a close talking speech mic.
Better IMHO would be the venerable SM57/58* or one of several dynamics now available at 1/2 the price. These also tend to be up to 6dB more sensitive than the SMs. An excellent compromise would be a small D capacitor.
*SM7b, would of course be even better but a bit out of budget?
Dave.