Thanks everyone. I am very fortunate to have such a nice bike. Hubby was a driving force in this decision. Great guy!
I don't think many men would have a big problem riding my tough-girl pink & black color scheme but their knees would be in their chins. That should keep my bike safe from them. 
Titus made my "short list". Too bad they aren't manufacturing again yet. And nice, used, XXS ones are few & far between.
I would have loved to have tried the 429 but I'm just too short. I like to know that I can come off the saddle fast & hard without hitting anything on the top tube. Fortunately the M4 is still a HUGE improvement over my too big hardtail in rolling over large obstacles. Our next purchase may be a 29'er for my husband.
LORI
Pivot Mach 4 / WTB
Updated Vintage Terry Symmetry / Bontrager InForm RL WSD