As for the s8 vs. s10 I've heard both speakers and I went with the s10 for the added bass and because my room is a medium size room. The s10 has the same detail, and clarity as the s8, but the s10 just has more bass. My s10 are 36" from the back wall and 13" from the sides and the ears to speaker distance is 12'6" in a 13x24 room. With my room size and seating distance the s10 is a great speaker that after listening to music makes you just smile and say "man that sounds nice". TNTGuy has the s8 and I've had several conversations with him and he has the same feeling after listening sessions with the s8 so maybe he will add his comments on the s8. In a smaller room I think the s10 bass could be overwhelming (not boomy just overwhelming). On bass heavy music the bungs come in handy and tone down the bass, but for most music I leave the bungs on the shelf. I would say it depends on room size, seating distance and how much bass you want. To my ears the s8 and s10 have the same tight punchy bass, clean mids, and crisp highs. The s10 is a very powerfull speaker that seems to handle anything I throw at it even at insane levels without breaking up. I like having the extra bass for most music, but for other types of music that have lots of bass I just add the bungs.
Just for reference the speaker that was the runner up in my demos was the Paradigm Studio 100 v3, which is a great speaker in it's own right. Both had strong, punchy bass with a sweet midrange, except the s10 had more detail and clarity. I really did have a tought time deciding between the two, because I had heard the 100 a couple of time before and had my heart set on them, but s10 just won me over.
"What do you mean it's too loud? My ears aren't even bleeding yet!"