Moon on a stick content possibly..
I know one answer is Cotic Soul but what other answers to the question could there be?
Has to be lighter than 5lb. When its 5.5lb+ its becoming 'is it worth it exercise' compared to a light full sus frame?
I'd love a Sanderson Life -but they aren't warrantied that high. The Soul possibly isn't but its got a strengthen tapered headset/CEN etc
Ragley piglet? (again over 5lb?)
Anything else? Alu - would it be too stiff, any good ones?
I can't afford a Ti frame.