Re: What pickup do I need?
and it's said to have a very warm tone
"Said" to have a very warm tone. While the mahogany does contribute to the tone, it doesn't impact your tone as much as your pickups or amp settings would. Also, while mahogany is generally regarded to have a warm tone, it's just a general ball park: every piece of mahogany will have a slightly different sound because it's wood. I own 6 guitars that are mahogany, and none of them sound the same acoustically or plugged in. 2 of those guitars are Les Pauls, and one of them, the R8, even acoustically, just sounds a bit snappier and brighter than people associate mahogany body wood with.
Point is that every guitar is unique, so you should really wait for the guitar to arrive first, and play with it, listen to how it sounds acoustically and plugged in before ordering any pickups. Spend at least a week or so just getting to know the guitar with your rig and play style, and really listen to how it sounds and what's working and what's not working for you.
This way it'll be MUCH easier for you to find a pickup that'll work for you. For example, "this guitar has a fizzy treble no matter how I play or set my amp", then easy, all you need to do is buy warmer sounding pickups. "This guitar is super muddy and honky and doesn't drive my amp hard enough", again, easy, time to buy brighter and higher output pickups. Heck, you might even play the guitar and go "you know what, I LOVE it the way it is!" Then you're happy because you just bought yourself the perfect guitar, and you saved yourself some money and time

That might happen since it's a PRS S2, they're very good quality instruments.