Hi Pie8ter (Great name!),
It sounds like you have a solid plan to protect your data. I just wanted to mention PHD Virtual Backup & Replication as a possible alternative to Veeam. PHD has all the functionality you need to accomplish your data protection goals. We can provide you with the same feature set as Veeam for about 60% of the cost and a much easier to setup and manage architecture. Here is a link to PHD's resource section of their website... there are many video, whitepapers etc... Virtual Backup and Disaster Recovery Whitepapers, Videos, Data Sheets, Analyst Reports
Also, I had a question about why you wanted to use Backup Exec in conjunction with the image based solution.... Both PHD and Veeam can recover files from their backups with having to spin up a VM. The both also have granular exchange, sql, and sharepoint recovery as well. Do you still have some physical machines that you would need to manage?? If not, PHD would be able to cover you on all fronts... saving you even more money. So if you're interested in a solution like Veeam, you should definitely check out PHD as well. Thanks!