IMO, I might consider taking Colossus if it added flat HP in addition to the % max, and/or increased the Healing rate — there are some heroes that really can use more hitpoints, but it’s tough to take one of your 3 level up boosts in hitpoints. Fatigue, Weapon Proficiency, and Melee Defense trump, it would seem to me.
Or perhaps increase the percentage to something like fifty or even hundred.
