CMS for coupon template

coupon cms system. I have a html template for coupons which is ideal for my needs but what I need is the CMS behind it so I can: 1. upload new deals 2. my clients can log in and see how many deals have been sold etc 3. members can log in and create an account etc.. 4. anything else useful.. There may well be something already out there we can think about buying or you may have already developed something we can cllone across which would be exactly what I'm looking for.. however if a cms has to be developed then I guess that's a route I might consider.. I'm doing this a very long time so please just be straight, honest and helpful so we can do this project as swiftly and as accurately as possible! more work for the right person..thanks