I'm going to correct myself))
OpenVZ and Virtuozzo are both SWSoft products and from what I've discovered in the research I've made, Virtuozzo seems to be a more robust virtualization platform and still offered by the majority of vps providers, you may check plans mentioned in the thread, my personal preference goes to HostV.com VPS deals with double RAM feature in the plan
http://www.hostv.com/virtual.shtml#