Core is our latest flagship cloud-based product. Check out its information on our website. You can start a free 15-day trial to see if it fits your business needs and check other resources on it. As Core is more flexible and feature-rich than ArchiOffice, we highly recommend switching your company to Core. Check the Core Help for details.
As for the pricing, Core and ArchiOffice are priced on a completely different pricing structure. Check out the Core pricing here.