Seeking thoughts RE: moving from CentOS+VMware to.... Xen? KVM?

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http://www.linuxquestions.org – I've a machine that has a AMD Phenom quad-core, 8 GB RAM, 2 - 1TB drives using Raid-1. And on this I'm currently running CentOS 5.3 64-bit and under it I'm running VMware Server 2.0.2; Oracle 11g R2, Apache 2.2, JBoss 5.0, and some other things I like. I'm stuck on this CentOS because of the issues using VMware Serve on Fedora, etc. What I do like about VMware is that it's utility package is mature and as long as you stay on a kernel it knows, it just works. However, that is boring and I haven't had to rebuild my machine in at least 6-months. One of the (HowTos)