Gaz,
i am in the same boat with you when it comes to being out of the know for some years now.....BUT, back in the "day" i had an infinity referance system in my scirocco, and initially, didnt like them, due to them being under powered, (amps) but after i cured that, wow, really liked them. if you dont go that route, you can never go wrong with Boston Acus. quality speakers, a wide range of sizes, and they all produce clean sound, and can handle power, and even when they are not all amped up, they still sound good....just my .02
good luck, and congrads on the 928, my second favorite porsche to the 356's