Wow, that's a long time as a lurker, Highwayman! I'm glad you "decloaked" and joined us. I too am a big fan of the PSP; in fact I have at least five of them! They're a great base to build on and a decent minimalist kit. Generally I do add a bit more tinder, a small firesteel, some Aquatabs and a bit more foil, among other things. It's unlikely that I'll ever carry just the PSP but it and a space blanket will get you a long way towards the goal of preparedness.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman