Disk Quota Software Recomendation

I am looking for a recommendation for disk quota software. I want to set varying quotas on our individual users home folders which reside under a shared folder on our Win 2003 file and print server. I something that will set quotas, send e-mail alerts to users, tie into AD, and allow me to set exceptions to the quota. I want to exclude the mail archives, *.pst,  from the quota total. I have looked at three products so far. 1) Check Quota Standard, which does not tie into AD and in my opionon is not a quality product but does allow for the exclusion of file type from the quota total. 2) CheckQuota Standard 3.1, this did not even seem to work. 3) SpaceGuard SRM which I was very impressed with and does everything I am looking for except that it does not allow for setting up exclusions to the quota total. So I am looking for a recommendation. Please do not suggest MS built in Disk Quota as it does not have the flexibility I am looking for. Once again I am looking for a recommendation for a product that will set varying quotas, lock users out when the quota is reached, send e-mail alerts when the reach a certain threshold, and allow me to identify files that should be excluded from the quota totals.