[libvirt] libvirt-0.3.3-14.el5 (redhat rpm) vs libvirt-0.6.5 (source)

Hello everyone, I am looking to write a simple php interface to create, stop, start, restart, configure, backup, transfer VM's across a network of servers. Storage is done locally on the particular node (lvm), but I am considering to do this through iscsi in the future. Xen, KVM, IP management, firewalling is an important requirement. The redhat backport version looks outdated, but I know the version number isn't the best way to compare features. My questions are: - Featurewise, is the difference between the redhat version and the libvirt.org source version small or as big as it looks (branch versions?) - Considering the above functions I am going to need, will the redhat version suffice? Any help would be truely appreciated, Thank you, Jim