Disk to Disk Backup Software

We have decided to go with Disk to Disk Backup based on the fact that we can get more bang for the buck for our needs. Now the issue becomes, what software to use to create the backups. There are multiple options out there but we have not found one that stands above the rest in functionality or reliability. We are looking for software that supports general file backup, exchange backup and SQL backup. We are looking for software that also supports bare metal backup and recovery as well. Some of the software companies we have run across are Vision Backup Server with Exchange and SQL, Symantec Backup Exec, Backup Assist, Acronis, Paragon Drive Backup Enterprise Edition, etc. Does anyone have experiences with any of these products? Any recommendations? Suggestions?