BTW, if I may make sugestment to your business. Make sure to invest in a good staff for customer support! Security and customer support are (in my opinion) the most important parts of a business.
If for example I make a support ticket and wait many hours to days for an response, I will be reluctant to use the service. While when the customer gets a fast and friendly reply within an hour, he will grow trust in your business and will most likely stay with you.
Unfortunately customer service is a weak point at many big exchanges, but I think if you make customer support to one of you priority's (after security), I am sure that you will grow to one of the biges exchanges in the market.