I'm sure I'm going to keep tinkering with this, but here's my current plan for Round 3:
This monstrosity is a mash-up of workouts from P90X, Insanity, P90X+, Turbulence Training, RKC Kettlebell Training, and a bunch of One-on-One with Tony Horton DVDs.
I know: It's a little messy, and it requires a shitload of DVDs. Plus, this program takes 105 days instead of a nice, round 90. But I tried to make this concoction as balanced as possible, while prioritizing variety and periodization. I also wanted to make sure that no single day's exercise session lasts longer than a typical P90X workout. (Even the Turbulence Training / Kettlebell / Abs days should take less than an hour to complete.)
As with my Round 2 P90X/Insanity Hybrid, I'm not recommending that you try this with me. I'm certainly no fitness expert; I'm just a regular schmoe who's mixing everything together for the hell of it. And like many experiments, this could very well blow up in my face.
But until then, it'll be fun.