You are proposing spending money on a new exhibition stand, now it is very important to consider how you will promote it. An exhibition stand should really be supported by a strategy of promotion and advertising, perhaps consider the following.
This area of marketing is often not considered, many rely on the exhibition organisers to promote the event in its own right. This does not always help your company as you are probably one of many providing the same or similar products/ services at the show. If you do not tell your clients and potential clients you are exhibiting there is a very good chance that your competitors will be inviting them to their own exhibition stand!