Hi all
What's in your opinion the best open source management solution for KVM?
Pros and cons?

This isn't a clear question.
What problem are you trying to solve?

I think he's not really trying to "solve a problem", not everything posted is a problem here ;-) He's looking for opinions, if I gather it right.

Imo it's mostly a matter of taste; Last time I checked RedHat had started on a KVM manager, but I don't know how it evolved.
AQemu looks promising, but due to being heavily in development yet not everything works at all times, a big downside to me at this point.

I have reverted to building a script that starts my virtual machines based on an .ini file, as is Alien Bob working on one I gathered.

http://www.redhat.com/virtualization/rhev/

Ramurd, I guess you are referring to this?

It pretty much looks like it, although back then it was free as in free beer... A quick tour learns that you have to pay some license fee for this product...