The bike i’ve kept the longest and still love every time is my Cotic Soda.
It’s the latest model which is lynskey made and rides so well.
I keep giving 29ers a try, but couldn’t bare to part with my soda.
Its my fourth ti frame, 5th if you count a warranty replacement Hummer.
As said before, don’t plan on it being a bike for life, bikes can break and if not i’m sure you’ll fancy a change at some point. (I’m around 85kg and ride pretty light, but i’ve broken a frame or two in the past)
If you can still get a Soda, do it i’m sure you’d love it, but seriously consider the Soul first. You could buy 2 and get them powder coated every year for 10 years and still be in pocket.