As noted, SM:P is all you need.
Ten Million Ways to Die is a great book for SM because it provides mundane arms and fire arms with SM armor types and RM armor types. EXCELLENT source book. The ammount of hits the modern weapons deliver is much more balanced than in Blaster law or Fire Arms Law, another plus (though still not perfect
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Robotics Manuel is also well done and provides all the cyber gear and android critical tables, robot crit tables, etc, along with some new attack tables.