You might be interested in prgmr.com . VPS based on Xen. The owner is also a member of HN and wrote "The Book of Xen" a couple of years ago.
Also since you mentioned UNIX, maybe arpnetworks.com . As I recall they run Linux KVM VPS but offer OpenBSD and FreeBSD if preferred over a Linux guest.
Also since you mentioned UNIX, maybe arpnetworks.com . As I recall they run Linux KVM VPS but offer OpenBSD and FreeBSD if preferred over a Linux guest.