Hmm... what must one do to get posting access to the policy sub-forum? I am just curious, as I want to contribute my thoughts for gen 5 in the future.
I never really liked Nasty Plot Ape. I prefer SD Ape, as it lures in the more common Ape checks like Tentacruel, Vaporeon, and Gyarados and nails them hard. From my experience, it is just harder to deal with than Nasty Plot Ape.
Nasty Plot Ape is by no means bad, but I just don't think it is the "best" Infernape set.
I used to run Nasty Plot/Focus Blast/Fire Blast/Vacuum Wave on Nasty Plot Ape. After a Nasty Plot, Fire Blast OHKO's pretty much everything HP Ice does, while Focus Blast hits everything Grass Knot hits, and hits Vappy. +2 LO Fire Blast really beats Gyara after rocks too. The benefit to running Infernape like I did is the fact that you can run max speed for speed ties, but also use priority.