I just spoke to a customer about an outdoor "Bar Open" sign. And, I don't know if she will purchase, but this system sure does meet her needs. What is the system? It is the Outdoor LED Module Sign system. It is MUCH less expensive than other outdoor LED signs, and it is SO flexible. It can be nearly 16 feet long, and it does store up to 3 messages.
If you are looking for an outdoor LED sign that allows upgrade-ability and ease of use, then please consider this product from SignsSeen.