getting ready to buy need advice

I need to buy a large backup "kit" - I'll be backing up both Windows and Mac filesystems/data. I have an XRAID w/ Fibre Channel and a few IBM e345 dual Xeons w/ UltraSCSI controllers I am looking for a autoloader unit that can handle in the 100TB range or so our GIS project division could have that much static data by this summer - otherwise we are talking only a few 100GB/week in dynamic data. I've built BRU once and suppose i can do it again... though rsync seems a happy way to do things on the Macs.. on the winders boxen - not sure yet... The Campus backup system (Backup Exec) has been hacked several times <sigh> and now the main "systems" are so burdened with their backups that they can no longer support backing up the divisional needs <double sigh>. A Canned system like Backup Exec or RetroSpec has certain benefits, but will it have the flexibility to backup the cross platform needs I'll have? what if I need to install bandwidth filters to slowthings down on some segments? Help!!!!!!! Rich