Don't let this segment of the market fool you
+1
some of my favorite Xen powered providers (based on their reliability):
UltraVPS.eu (aka ProviderService, Germany)
CloudVPS (their VPS line is Xen, but the OpenStack line is KVM, Netherlands)
VPS.us (Netherlands)
VPS.co.za (South Africa)
Prometeus (Italy, USA, India)
ServaRica (Canada, Montreal/Cologix DC)
HostVirtual (16 locations worldwide)
When I virtualize a server for my company's internal use I only use Xen (or OracleVM which is Xen based).
edited because I forgot one:
NFOservers VPS's use Xen HVM (and dedicated not shared cores)