Hi Jeroen,
I think you got a good grasp of the high level of CR. I normally recommend using the CR. Although in this case you may want to investigate at the latest bug tracker. When I was a sys admin I used to use a CMDB using Lotus notes. I think the bugtracker should be a good fit. The latest one I think enable you to customize almost every aspect of it. You may want to ping Collaboraid for more details about it.
