SeaNile, I saw you posted on AVS and I wanted to comment, but I'm not a member there. I'm happy I can do so here.
The SS8s represent the best value in the Soundscape line. You get better sensitivity than the 10/12 and a traditional box design (which is a plus, IMO) at a greatly reduced price. You miss out on just the very lowest bass extension, but for the price/performance ratio this is absolutely worth it, in my opinion. I've had them for about 6 months, and I've never wanted more bass than what they provide. Even on movies with brutal LFE I'm blown away by the bass.
I think the biggest personal preference you need to decide is if you'd lean towards "accuracy" or "romance/warmth" in the presentation. The SS8s are extremely accurate, which is exactly what a lot of people are after. The Accuton is so detailed, and the RAAL gives an almost ethereal presentation of the high frequencies. But the cost here is that nothing is glossed over. Bad recording or equipment and you'll know it.
The option to open the back and use some/no stuffing is a really great feature. I prefer them with the back open and some stuffing, the soundstage is broader and voices are somehow more real this way. The speaker really sounds bigger than it is.
The SS8s are at home cranking loud or playing softly.
All of this said, if you were after a warmer presentation at the expense of some micro-detail, you may consider the Exotica 3's or another design with a softer mid-woofer. Another option for a warmer presentation but still utilizing the SS8s would be to pick up a hybrid tube amp or pre-pro as offered by Van Alstine, which is probably something I'll try down the road.
Hope this helps! -Jon