Traffic Shaping With Iptables

I want to limit bandwidth on a per user basis with the use of iptables and the "owner" module for example each user can upload 65GB per day at 100Mbps then once 65GB is reached in a 24 hour period the upload speed is capped to 200 kB/s, at 12.00 am daily each users allowance is reset. A log of each users stats should be kept and available to view like in vnstat through SSH A cronjob of some sort will need to save each users statistic so if the server reboots, each users allowances are not reset. The server is a dedicated server running ubuntu 10 64bit with one public IPv4 IP address, all traffic will pass through one physical interface(eth0)