We think alike Phil! I have been using Powerquest V2i, which was bought by Symantec and turned into Livestate which is now once again renamed to Backup Exec Recovery (probably the worst Symantec naming move of all time, and BE is pretty much exclusive to Vertias Backup Exec).
Anyways, i do use imaging, however to an Exchange mailbox restore, SBER won't do it, and is only used for full system imaging. That still is handy.
The tape drives will most likely have to move exculsively to Exchange backups only and not regular data which is too bad. Our tape drives are not LTO, just 24gig DAT's and they can get expensive especially going above the 24 gig mark or to LTO.
If the NAS worked, we would be set. Also, if FTP worked that would be fine, but we may have to use a WAN VPN solution for some of this data. It unfortunately is hundreds of gigs and offsite does not appear to be a viable option at this time.
Thanks for the information though!