The Head Raptor comes in the Raptor RD and RS.
The Raptor B3 RD is a 120 - 130 -140 flex boot depending on whether you put in all the bolts in the back of the boot. This is narrow race specific boot that has a 95 mm last (width). Probably not a good choice for a typical skier. It has a lot of plastic and is also stiff laterally.
The Raptor RS 130 also has 120 - 130 - 140 flex, but is a bit wider at 98 mm last. It is a race ready boot, but does not have the really tight fit of a plug boot like the B3. This would be a good choice for an aggressive and strong skier.
Your Solomon Impact is 110 boot with a 100 - 106 mm last (the new ones are moldable) and is more of a general purpose boot that is good for strong skiers with a mid to wide foot. It is not as stiff laterally as the head.
Having sufficient "stiffness" is dependent on skiing style, aggressiveness, and skill, in addition to the weigh of the skier, but your weight would probably call for a stiffer boot. Remember that stiffness that is measured as flex only refers to forward stiffness, and not lateral stiffness. You will probably find the lateral stiffness of the RS much better than the Impact, in addition to the "flex". My 120 pound racer daughter uses a 120 flex Rossi race boot, but the boot would be too much for most people her weight.
I've used the RS 130 and found the stiffness to be be good for me. I weigh 175 and I'm an aggressive skier. Ultimately, the boot didn't work fit as well as I'd like, so I went to a Solomon CS 130 which fits my foot like a glove. One of my kids coaches, who weighs over 220 pounds bought the RD 150, and ended up softening it quite a bit for daily skiing. he found the stiffness much too harsh for free skiing.
Your are kind of all over the place with boot width, and I'd suggest that you use caution to make sure that the boots fit well. Get a sense of whether you have a narrow, medium or wide foot. Try on a bunch of boots before deciding on the RS. The 2013 ski mag buyers guide does a nice job of identifying a bunch of good boots with narrow, medium and wide fit. Other boots to try on for a narrow fit include the Atomic Redster, Rossi Experience 130, Lange RS 130 (same as rossi), and Solomon x max 130, but if you have a wide foot, these night not work well for you. Too wide of a boot cab introduce slop, but too narrow can be uncomfortable.
With the RS, assuming a good fit,you can put in all the bolts and have a 140 flex boot, or if that feels too stiff take out a bolt and lower the flex, but you can't easily make it wider.
Edited by canadianskier - 10/8/12 at 10:28pm