Well, that's going to be better than what you had before... but you'll need to be close up in the speaking actor's face all the time.
Maybe that's good enough for what you need to do... maybe not.
Having a shotgun on the end of a boom would be nice. That may be a problem if you don't have a person to hold it, though.
I have no idea how much that would cost to buy, btw. If I need a mic/boom/recorder, I just rent the kit.
I don't know enough about brands to recommend anything in particular.