Crossfit is not the only answer for circuit training. I'm actually far more partial to Rhadi Ferguson and JC Santana's methodology, or the contrast method complexes used by Christian Thibeadou.
If you are looking to add strength, it would certainly be worth your time to check out Westside Barbell (they do Matt "the Immortal" Brown's strength and conditioning), Jim Wendler's 5/3/1 Simplest Strength Template, and Dave Tates EliteFTS.com (Dave has been brought in by Crossfit HQ to teach power lifting techniques and block periodization for Crossfit athletes).
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