Best Bang for the Buck Supercharger?

Ok guys, I was wondering what you guys thought was the best supercharger for the money? I know one of the most popular is the Kenne Bell, but it's a bit out of my price range. I was thinking about Vortech, Procharger of Powerdyne. I havne't researched many roots type superchargers yet. What do you guys think would be the best for the money.? And would you guys consider buying a used supercharger? The cheaper the deal the better in my opinion. Thanks guys, and feedback would be appreciated.
 
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