Alot of VPS Host use OpenVZ or Xen for the Virtualizations. And most of the host will use SoulsVM or HyperVM both are great. Do a search for VPS hosting and pick some host that fit your needs and send some pre-sale emails...
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Speaking about VPS servers, I should say that Fastnext offers new reliable SSD VPS servers.Moreover, as far as I know they provide free CDN service which is a great solution for those sites which has a lot static contents.Their servers are located in reliable Germany and US datacenters.
Well, I've ordered SSD VPS from Fastnext a couple of months ago and really happy with their services. Support team is nice and fast in response, server is stable along with reliable price, so obviously I'll stay with them for a long time.
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