The four horsemen of tech are riding higher, Jim Cramer told viewers of his "Mad Money" TV show Friday. Research In Motion ( RIMM), Amazon.com ( AMZN), Apple ( AAPL) and Google ( GOOG), are up 45% on average since he grouped them together, Cramer said. RIM is up more than 100%, breaking a new record after a monster quarter, Cramer said. Apple is at a new high, and Amazon and Google are very close to their respective highs as well. While it's good to own these four horsemen, a portfolio needs more than tech, Cramer said. He told viewers that next week they should buy $80 stocks. But not just any $80 stocks, he said, $80 stocks that should go to $120. In a bull market, Cramer believes that $80 stocks usually reach $100, and most go all the way to $120. Earlier this year, he recommended stocks based on this $80-to-$120 thesis. But at that time, Cramer said, "the bull market was on the ropes," and the thesis didn't hold up. "The stocks got damaged as the market fell apart."