Chimera for sure - much more control (with an eggcrate especially).
1k for a back light!! I use a pepper 100 with scrims AND diffusion.
The other problem with throwing a ton of light around is...
stopping down yur lens more, creating more depth of field, ergo making your backgrund sharper, which is not desirable for many (though not all ) interviews.
In my kit (freelance only) an Arri 1k open face (almost neveer used anymore), 2 Tweenie 650's (one is the key into a samll chimera - the other back up), an Arri 300 fresnel - BG light, 2 Pepper 100's (w/200w bulbs) for hair/kicker/accent lights.
And to much grip gear to count...
E