Re: PGn or A2Pn?
It's a tough choice. I really like the APH, but it can get a bit TOO warm and smooth, depending on the guitar. In the right guitar, one that is a bit on the bright and snappy side, it is the sweetest pickup on earth. It's still my favorite SD neck pickup.
The PG has a little more sizzle, clarity and brightness. It's still smooth though. My choice for an Epi is the APH. The bodies are usually alder instead of Mahogany, so I think the APH works better. However, if anyone know's good tone in an LP, Epi or otherwise, it's Jolly.
You can't go wrong with either one.
If you want to hear each one of them, click on "My Soundclips" down in my sig.
Heavens Door is the APH in a double fat strat. It does all the clean rythym and the leads.
There is a soundlip called PG

there also. It's just a raw clip of a PG thru my JCM800 to a backing track...in a Dean Hardtail.
At least these should give you some idea of what the pickups sound like.