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Xen and KVM are competing projects. I think you were assuming I meant "virtualization" in general by the term KVM.
At any rate, I just set up WebVirtMgr. It is a hosted website through which you can manage your KVM. Screenshot below.
Basically I chose kvm because I wanted software RAID. Didn't want to shell out for a raid card. Vmware and Oracle VM don't have software raid. Didn't want to pay for Windows Server. So I just installed ubuntu server and chose to only install OpenSSH Server and Virtualization Server packages.
WebVirtMgr is pretty cool. You can see what it does on the screen shot. All you have to do after you Ubuntu install is change a few options in two files and add a user. The whole WebVirtMgr website consists of 1 page of those instructions, then the login to add your server and manage it. In fact it took me a few days to realize it was a hosted service. I thought it was a web package you installed on the server.
I haven't used convirt, but according to the data on the website, the featureset is poorer than oVirt's - no HA and load balancing, no self provision portals, SPICE is not in use, no specialized distribution for hypervisors. I could probably go on, but really, the choice is yours - this is the beauty of opensource.