Some great stuff already mentioned in this thread, and most of the best ones have already come up, but I'd say that Golden Swallow, the sequel to Come Drink With Me is actually a pretty worthy follow-up, even if there's more Jimmy Wang Yu than Cheng Pei-Pei in the film to which I'm inclined to say boo, but Wang Yu does actually impress by the end. He's also great in The Chinese Boxer, a film that maybe should be a classic, as it is bloody and beautiful in the best ways, and features a teahouse fight that holds up incredibly well. Also a fan of Chang Cheh's Vengeance, for both the elegantly choregraphed bloody knife carnage and David Chiang's floppy hair. Other great Chang Cheh films from that era include The Duel, The Heroic Ones and The Blood Brothers (featuring John Woo and Godfrey Ho as assistant directors). The Chang Cheh films can get a bit samey after a while, but the great ones are great. Also, if you're a fan of Sammo Hung, Shaw produced a lovely biographical film about the early days of Jackie, Sammo and Yuen Biao called Painted Faces, with a very touching performance by Sammo as his former teacher.
Chor Yuen has already been mentioned but he really is one of the best Shaw directors, as he really leaned in to that sort of artificial, set-bound vibe that characterises Shaw productions. His period-set films have a smokey, dreamy vibe that I can't get enough of, especially the aforementioned Intimate Confessions of a Chinese Courtesan, and also Killer Clans, The Magic Blade and The Sentimental Swordsman. Chor Yuen seems to me like a bit on an unsung master whose reputation will grow now that these films are becoming more available in better versions worldwide