The S10 is a great choice-probably better than the S12 if you are taking bumps seriously. It has only 1 sheet of titanium. I tend to ski aggressively and fast on the groomed, and the S12 is a better choice for me. But, if I was skiing in more challenging terrain such as bumps, the S10 would be preferred-it is almost as stable at the S12, but more forgiving. Also easier in the choppy snow, but both are really good there. It depends on how you classify yourself. I started last season as a strong 8, and worked my way up close to level 9, and found the S12 to be a handful at the beginning of the season, but not so when I improved a bit. Ironically, I would probably go with the S10 these days (for bump performance) and will probably buy a pair of GX Fusion's for strictly hard snow (the 178 is amazing-I weigh 150lbs, and they were as stable as a pair of SuperG skis, but easier to turn than my 21m race stock 180 GS boards). That, and the 666 Fusion for deeper snow will be my quiver for the season.
Anyways, if you want to get your hands on any of the aformentioned skis, PM me. I have basically every ski in every length at this point, and can probably do at least 15-20% off of street price-we are having a "pray for snow" sale here in the PNW.