All of us made some questionable decisions back in the day when we started playing this game (either here or in DMM). Don't worry about that. Steeper initial curve with no Gold Rush units, but you will get them eventually

If you are that close to getting Spica, don't really bother CC'ing a Soma. You will barely use her and other units require that CC more than her. Katie will be a top choice, so go ahead. You will be using her a lot.