I'm a big fan of products by Fantasy Games Unlimited. Psi World was one of my '80s games. I bought it and all the supplements and played it all through the '80s.
It gave me the opportunity to play both sides of a situation - one of the possible campaigns was that of government agents fighting against the psi menace hell-bent on taking over the world with their ultra-normal powers. The other was valiant psis trying to protect other psis against the totalitarian government hell-bent on making them a scapegoat for government corruption.
There are a bunch of reviews (1, 2) on RPG.net and it's on sale online for a good price.
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