I say go for it if it feels right to you. It sounds like you have the right people to help you. You can over analyze these decisions. If it feels right go for it. The one thing I would do is see if the current owner would stay on for a short time to introduce you as the new owner to all his customers. I think that might help in retaining the current customer base. I've always lived by the saying: it's better to try and fail then to never have tried at all.