I've been selling the 661 stuff for years and of course it's all personal preference and what fits the best but this summer the AlpineStar Stella protective gear is becoming more and more popular. Something to look into as well.
Myself, I wear the Alpinestar prtective suit, my dad has used the 661 pressure suit for a few years now. I believe the back protection and venting is much better than the 661, however dad doesn't like the fact that my chest protection is split in the middle of the chest whereas the 661 is a 1 piece design in regards to the chest area. Something to think about? I haven't had an issue yet.
As far as the Core Saver goes, I have sold a couple, however, protecting the shoulders, elbows are important to people as well.
In all, you don't need to pick the PRO pressure suit, but maybe the COMP suit would do just as well. And the price difference is very minimal for the extra protection you receive.
Like I said, personal preference and comfort is the basis for these types of protection. There's enough brands and style's out there to fit most anyone. Try a couple before you buy if at all possible.
BTW - I was laid up for 3 weeks with a shoulder injury while dirtbiking to start the year off. I was not wearing my suit. Too much of a hurry to have fun and I forgot it was with my sled gear. Now if I could just do something about this broken foot issue....