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Looking at the figures reach wise certainly the Scalpel and Epic are similar the the XXL SC.
To be honest I ended up on an XXL because i felt the others were too small because i was used to XC bikes.Only thing I have found; Cannondale have specced Stans Crests which have a weight limit of 86KG... I'm 95. I suspect on a FS I could probably get away with it. Otherwise i'll stick some flows on which i currently have on my XC hardtail and have held up to 4 years of abuse with only 1 trueing a few weeks in.
I went for a ride on some trails at the weekend and it made my mind up, the Santa Cruz is simply too much bike for me. Everything I want to do can be done on a hardtail, but i'd like the extra comfort and niceties that come with a bit of bounce. The other thing I discovered I enjoy ups more than downs...
Not sure how many XXL FS XC frames there are?
I haz an Epic - light S works build - very good, faster than my HT on XC courses. Also recommend Salsa Spearfish if you like doing miles.