Cheers guys, some good info on here.
Like Kaiser says, its an itch but could turn out to be very expensive scratching it.
Having been away from bikes for almost ten years and not quite the xc whippet I once was, the thought first occurred to me after a rooty ride on the Klein beat the crap out of me. Obviously I'm not riding as hard as I was back then and the stiffness of the Klein is obviously great when you're going for it(ie race mode), but approaching middle age possibly looking for something a little less focused, more forgiving for a bimble in the woods.
I know titanium is more flexible than steel and aluminium, supposedly giving a softer, less rigid ride but I seem to remember Merlin and maybe others coming out with softails with an inch or less of travel, any point to these and will they break? Also seem to remember Ibis I think coming out with a rear suspension bike (Ti-Bow?)with no shock, just relied on the tubes flexing.