A quick update:
I started Week 8. It's supposed to be a recovery week, but I'll just continue doing Phase 2 workouts. I'm noticing better results than the first time around, and it has to do with two things: A) eating better and eating more protein B) I increased weights to 25 lb (per dumbbell).
I am still looking into Rushfit, and it seems like a fun thing to do for a week or two, but not sure if I would commit to it for full 8 weeks. I'll definitely do a week of it after I'm done with the second round of P90X (September 11, but I might take a week off, so it will be September 18th when I start).