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NEW YORK ( TheStreet) -- This terrific market just keeps going higher, Jim Cramer told "Mad Money" viewers Friday. But his game plan for next week's trading is still to urge caution, so investors should do their homework and only buy on weakness and not into strength. Cramer said on Monday he'll be watching Caterpillar ( CAT), a company he said has set the bar too high. He advised buying CAT only under $93. Yahoo! ( YHOO) also reports on Monday, and Cramer said that company's new CEO continues to turn things around. Tuesday brings EMC ( EMC), about which Cramer has some trepidation, along with Ford ( F), Pfizer ( PFE) and Amazon.com ( AMZN). Cramer said he's a buyer of all three stocks, but only after they report and especially if they get knocked down. On Wednesday, it's Boeing ( BA) and Qualcomm's ( QCOM) turn at bat. Cramer said he'd steer clear of Boeing and use United Technologies ( UTX) or Honeywell ( HON) for aerospace exposure. As for Qualcomm, Cramer said he wants to listen and hear that company's take on the saturation of smart phones. Thursday's stocks include DST Systems ( DST), Fortune Brands Home and Security ( FBHS) and Manitowac ( MTW), three stocks Cramer said need to do unlock some shareholder value. Also on Thursday, packaging makers Bemis ( BMS) and Berry Plastics ( BERY), two stocks Cramer recently featured as buy, buy, buys. Finally on Friday, Exxon Mobil ( XOM) and Chevron ( CVX), a stock Cramer owns for his charitable trust,