That should be your first option, why would you buy something that costs extra when you already have a solution? Any KVM will add some signal noise, the higher the resolution, the more distortion you will see. You'd need to spend probably $50 or more on a KVM to avoid that even at short cable runs. Plus I don't think I have seen a KVM or a video input switcher that had different inputs you can use that was under several hundred dollars. The ones I work with in conference rooms are around $1,000 or more.