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We don't use cPanel, we are a PLESK shop. However, midphase may be good - but with any provider that offers "unmetered" anything, you better read the use agreements close. Especially if the cost is cheap. You usually get what you pay for. How and what is measured on the "unmetered" service is important to you. I also noticed that they have CPU capping. Not a bad idea, but that may send up warnings if you get stuck on a highly populated shared server. I had a friend who was hosing with a well known company out of Florida. His site had very little traffic, but was bandwidth choked all of the time. It's because the server had over 50 sites on it, each needing at least 4% CPU. 4*50=200%!
Just my opinion...
You are both asking for Virtual Private Servers - which is shared virtual hosting by most companies definitions.
turnerrw - if you are really getting what you say, VPS probably isn't what you need. You probably need dedicated hosting. And there are cheap solutions out there. But going that direction...I wouldn't use cPanel.
upsadaz - 20GB disk? Hmm, eitehr it's a really huge site, or you have a lot of graphics. Also, you want to always look for companies that provide proactive monitoring of your mySQL or Postgres databases engines. These are usually what kill a server on high traffic sites. Not the actual traffic themselves.
Good Luck!