NET ADMINS - Enterprise backup solution needed

We are in need of an enteprise level backup solution (so no suggesting a DVD-rw and a box of disks..not even dual-layer) we must back-up around 25 servers with various data; apps, SQL, Exchange, etc. to a central location. The current solution we are leaning towards is a disk-to-disk-to-tape solution, consisting of Overland hardware which would be a Reo 4000 disk unit with 2TB of cap. (expandable to 8TB) and a Neo 2000 tape library which would hold 30 LTO2 tapes (6TB native uncompressed) The backup software is also in question, the vendors are recommending Bakbone Enterprise Ed.

Questions:

If you are a network admin what do you use at your location.

Has anyone used Overland hardware before, if so opinions please.

Same with Bakbone software.

Does anyone have a better suggestion for hardware and/or software.